-1When Harry met Susan

Rating: Teen for the moment, but may increase to mature depending on what goes into the story.

Warnings: Occasional bad language, Action violence, fluff, possibly smut in later chapters.

Summary: A magical accident sends Harry to Discworld where he meets Susan Sto Helit and gets involved in the events of Soul Music before returning to earth to stop Voldemort.

Authors note: This is my first ever attempt at a crossover story. It goes without saying all rights and names belong to their respective owners and this story is not written for profit. The story is set during the early parts of Half Blood Prince, and during Soul Music, Discworld time assume cannon up to the end of Order of the Phoenix and beginning of Soul Music, but some aspects of both stories will change to fit the crossover details and form then on the story will be a shameless AU.

Prologue: One Step Into The Unknown

Harry was concentrating as never before, he had just come across an interesting spell whilst researching ancient magic as an assignment for Professor Flitwick, the class had to research a spell that had fallen out of common use and write an essay about it's uses and if possible perform it at the next lesson. He turned the page of the old book he had found in the library and read. The Rite of AshKente, this spell, when performed correctly summons Death into a circle of power where he may be asked questions by the summoner which he must answer truthfully. The great leveller has much wisdom of both present, past and future… The spell book continued on describing the ritual in detail, down to the incantations and required materials, which Harry noted were easily obtainable. Harry was intrigued, he was curious as to why the ritual had fallen from common use and resolved to show the book to Hermione. Shutting it he went to the librarians desk and checked it out before walking back to Gryffindor tower, finding Hermione working on her own essay he walked up and said.

" Hey, Mione, guess what I found while I was doing some research for that assignment for Flitwick."

Hermione looked curiously at him and said, "Whatever it is must be interesting to have you this fascinated by homework."

Harry laughed and showed Hermione the passage about the Rite, she seemed genuinely intrigued and said, "This is interesting, it doesn't seem like a dark spell, maybe it just fell out of use, it does happen, are you going to use it for class next week?"

Harry looked at her and said, "I don't see why not, it doesn't look too difficult and it seems to meet Flitwick's criteria."

Hermione nodded and smiled at Harry, who got out his writing equipment and began to write his own essay which he finished a few hours later. Ron came and joined them and seemed slightly uneasy about summoning Death but was reassured by Harry and Hermione that the book said it was perfectly safe. Later on that night Harry went to sleep and began to dream, he saw himself standing in a landscape of rolling hills, however as he gazed around he noticed that everything was in a monochrome spectrum, except for a vast field of corn. Curious, Harry walked on up the hill and came to an old fashioned looking house, a welcome mat stood in front of a door which opened as Harry approached. Stepping inside he noticed that everything was bigger than the outside of the house suggested and skull and bone motifs were everywhere, seeing doors set into the walls of the hall, Harry went into the nearest one passing by a an umbrella stand with what looked like a scythe and a sword in it. Stepping inside and walking towards the middle of the vast room Harry saw that he was not alone. A young woman in an old fashioned looking black dress sat at a desk, however she was unlike any other woman he'd ever seen, she was tall and thin and looked around Harry's own age, but what really attracted his gaze was her hair, it was white blond and curly with one black streak in the middle and was tied in pigtails. How long Harry stood there simply gazing at the woman he did not know, but as if sensing Harry's gaze the she looked up and as their gazes locked, green eyes meeting silvery blue. Her eyes widened slightly as their gazes locked and in that instant Harry woke up and found himself in his own bed. He looked around and swore softly before going back to sleep. Next day Harry didn't mention the dream and put it out of his mind as he attended his lessons, however as he was leaving his last lecture he saw the batty form of his old divination teacher walking along the corridor, he saw Professor Trelawney begin to shake which reminded him of the time she made the prophecy of Pettigrew's escape. Panicking slightly he walked up to the Professor as she began to speak in the harsh tones he'd only heard once previously.

" The one orphaned by the Dark Lord shall walk into the unknown. He shall traverse the void and travel into the realm carried by the turtle. There he shall meet the Granddaughter of the leveller and aid her in her quest. Together the orphans of light and shadow shall defeat the dark one and bring forth a new age to the two worlds bridged by the magic of the orphan of light, and when light and shadow merge they shall find in each other the missing half of their beings."

Professor Trelawney coughed and slumped forward and seemed to come to herself a few seconds later, Harry ran from the scene his heart pounding. Later on when back in the common room he told Ron and Hermione of the prophecy and the dream. Hermione looked shocked and said.

" Maybe she was predicting an outcome of your charms experiment, be very careful and make sure you follow the directions carefully."

Ron looked curious and said, "But how could Death have a Granddaughter? He's a skeleton it's not possible. Besides, your spell summons Death, it doesn't do anything else, how are you supposed to get there? Can we really trust this prediction? You know what Trelawney's like, and besides, what's the missing half of being stuff supposed to be?"

Harry shrugged and replied, "I have no idea, guess there's only one way to find out."

So next week Harry, Ron and Hermione walked into the charms class and sat down, tiny little Professor Flitwick bode everyone to hand in their papers and get in line to cast their spells. Harry watched impressed as his classmates performed some very impressive spells including Hermione, who animated a small stone statue which she was then able to move around the room with her wand. Finally it was Harry's turn, he got out a piece of chalk which he used to draw a pentagram on the floor, after drawing runes at the cardinal points he put the four pieces of wood and 4cc of mouse blood the Rite called for in the middle of the pentagram and began to chant the incantation he had memorized. However what he hadn't noticed was that Draco Malfoy had just got out a small vial of potion. As the air began to shimmer inside the pentagram and Harry saw the outline of a robed figure, Draco threw the vial which smashed. A powerful wind swept the classroom and Harry felt himself being sucked into the middle of the pentagram. He fell backwards and into what felt somewhat like a portkey as the very air ripped open. Harry saw what looked like a tunnel made of light all around him as he flew faster and faster through it, and he wondered just what had happened. On and on he flew until he eventually felt himself slow down and land face down on what felt like grass. Harry laid still, as he felt dizzy and was just beginning to wonder what to do when he heard a voice say.

"Who are you? And what are you doing here?"

Harry got up slowly and turned around and saw a middle aged woman walk towards him, she looked around the same age as Professor McGonagall and wore old fashioned clothes and had short grey hair and wore round glasses. She stopped and repeated her question.

"Who are you young man? Why are you here?"

Harry pondered his answer for a moment and said, "My name is Harry Potter ma'am. I'm a student wizard, I was caught in some kind of magical accident and was transported here. Can you tell me where I am?"

The woman looked at him a with a little more kindness and said, "You are at the Quirm College for young ladies Mr Potter, If you'll come with me I can arrange transport for you to get back to Unseen University."

Harry guessed that Unseen University was the local wizards school and nodded politely and followed the woman inside. She led the way into a spacious office and bade him to sit down, but before he did he noticed a piece of paper stuck to a file on the desk which read 'you are interviewing Susan Sto Helit. Try not to forget it.'

The woman who'd brought him in noticed his gaze before saying, "don't worry, just a girl who has a few unusual abilities."

Harry felt curious but put it out of his mind as the woman said, " My name is Miss Butts. Just what were you doing when your accident happened Mr Potter?"

Harry guessed the woman was a muggle and said, "I was attempting an ancient summoning spell as part of a research assignment, somehow something interfered with it and I got sucked into a portal and landed in your school grounds."

Miss Butts frowned slightly and said, "I can't say I approve of wizards much Harry, but if you were only doing your training I can accept that you didn't intend this. I'll send a message to Unseen University and they'll send someone for you, In the meantime you can stay here at my school. I'll get one of my girls to keep an eye on you."

Harry nodded and waited while Miss Butts got up and walked out of the room, and as if drawn by a magnet Harry looked at the file on the desk. It seemed like a collection of work from the girl Susan who supposedly had unusual abilities that the teacher mentioned. Harry looked at the work in the file and thought that whoever the girl was, she seemed to have had a fascination for the occult from an early age which made Harry slightly uneasy, but Harry knew he couldn't judge her without meeting her. Harry heard footsteps, and quickly put the file back where he found it. The door opened and Miss Butts came in followed by a girl of about his age wearing a loose blue dress of an old fashioned style. Harry's eyes widened as he recognized the girl at once as being the girl from his dream.

He quickly tried to hide his astonishment as Miss Butts turned to Harry and said,

"Harry, I'd like you to meet Susan, one of my final year students. She is the Duchess of Sto Helit, and has a few unusual abilities. I thought perhaps since you're a wizard she would be the best choice to keep an eye on you while the Unseen University sends a cart for you."

Harry, remembering his manners bowed slightly before saying, "Nice to meet you Your Grace, I hope I'm not putting you to too much trouble."