Revision.

These were the days Valkyrie wanted to switch her identity with her useful and appreciative reflection. She was stuck in her room, made by her parents to revise for her Summer exams. Valkyrie knew it was no use to her revising as she probably won't even do it as she was so busy with investigating these days. Sometimes fighting bad guys who could destroy the world and kill every living thing on this planet was better than going to school. Anyway, she would have to suffer through the memory of the revising and of the actual exam. But Valkyrie decided to follow her parents wish and do what they actually told her to do. For once.

Her parents were out for awhile and Valkyrie tried to focus on her revision before her. It was Maths, Valkyrie's most hated subject yet.

She now discovered how bad she was at not knowing things. Maybe she should attend school more often. She thought about it.

Nah.

Valkyrie continue to stare at the page for a while and thought she grasped something it had said.

When she was working out the equation after a few minutes, a tap sounded at the window.

"Go away!" Valkyrie insisted.

She had an idea who it might be. There were a limited few who could climb up her window and tap at it with hollow, skeletal finger.

'Tap'

She rolled her eyes and tried to ignore it, reading the same equation for the fifth time.

When the third tap echoed in her ear, she turned to the window and, indeed, there was Skulduggery Pleasant.

"Don't worry, Valkyrie." He said perched on the slight shelf of the window. "Please take your time. I'm sure your neighbours would understand that a skeleton is lingering outside your bedroom window. Not so much a skeleton in the closet, more like a skeleton hanging out the window."

Valkyrie smiled and slid up the window frame and he jumped inside.

He noticed the stack of books and papers on her desk.

"So, this is the 'nightmare' teenagers call revision? "

Valkyrie nodded. She now was glad Skulduggery had came. She wanted to trick him to answering the questions for her. He picked up a question sheet and read out the first question out loud.

"Solve this equation, 'Solve this equation, 4x+7y-2x.'" He lifted his chin and thought. "13xy."

Valkyrie frowned, "Are you sure?"

"Of course I'm sure. I am an extremely intelligent detective. I have you know that I won a medal at a competition when I was younger."

Skulduggery stood with pride.

Valkyrie doubted that was likely but she just shrugged, took the paper from Skulduggery's bony grasp and sat at her desk, writing down Skulduggery's answer.

All afternoon, Skulduggery 'helped' Valkyrie into her homework and Valkyrie was quite confident Skulduggery got them right. If the 'amazing' Skulduggery didn't know about it, it wasn't worth knowing.

When Valkyrie and Skulduggery were done she sent the reflection out. The reflection seemed very impressed at how Valkyrie finished her revision question and didn't question Valkyrie but put the sheets in Valkyrie's school bag.

After a couple of days, Valkyrie came home very late and greeted her reflection who was laying awake in her bed. Valkyrie asked her about her day. Valkyrie had a unpleasant shock.

Her reflection brought out the homework sheet and handed it over to Valkyrie cautiously.

Valkyrie couldn't believe it. Every answer on it was wrong.

I big fat 'F' highlighted her work and she crossed her arms in annoyance. "I'm going to kill him."