Disclaimer: Do I even have to say it? We all know the drill, "I don't own this..." etc.

A/N: I've been trying to figure out a way to make a crossover of my two favorite things for a long time, and at last, this is it. Sweeney Todd and Harry Potter.

Warning: I have little to no idea where I'm going with this, but I have a good feeling it will be 13+. Without a doubt, there will be violence. It's not for the squeamish. Also, it's really AU, so beware.

Chapter 1: Call of Duty

Albus Dumbledore sat at his desk doing paperwork. It was always a tedious task and at that very moment he would have much preferred to be reading, but, unfortunately, that would have to wait. He took a sherbet lemon from the dish in front of him, and carried on with his work. The sun was setting slowly. He knew for a fact that there was no way that he could possibly finish his workload in the remaining hours of the day. He tried to calm himself, but was interrupted by an owl with a heart shaped face at his window. It turned its head to face the headmaster, as if to communicate something. Based on the glare, he seemed to know that even the bird was aware of the terrible news within the parchment that was now in his hands. The headmaster nodded in thanks to the owl and it flew away. Dumbledore gingerly opened the letter and read,

Dear Headmaster,

I am afraid I must inform you that the Dark Lord has returned. We all knew that he was not completely ridden of. His horcruxes are still out there. Obviously Lily's son must be the one to destroy them, but for now, I think it would most likely be best to stop him now before he gets worse. I have been notified as to what exactly the Dark Lord has been plotting, and unfortunately, it will not be at all easy to 'nip in the butt' as some may say. Have you ever heard of the serial killer Sweeney Todd? This will require no more than two Order members, aurors, or anyone else qualified in battling He Who Must Not Be Named, aside from myself. Chose wisely who shall accompany you. I shall disclose more information to the two of you in the Room of Requirement tomorrow evening. That is all.

- Severus

Merlin! Thought Dumbledore as he sat before the letter in awe. Voldemort had been supposedly "dead" for two years. He knew that the day would one day come when Voldemort would live again in a ghost of his former self, but he had hoped that it would never be this soon. By the time little Harry got to Hogwarts was ideal, but that was out of the question at this point. Only he and one other along with Severus could fight Lord Voldemort. He knew that only one person that he could trust to help him. He stood, pushed his chair in, took the letter, and headed to Minerva's rooms immediately.