If you were going to write a book, what would you call it and what would it be about?

Ohh this is a good question! This is actually orignal c: . I am not sure on a title but I actually have been writing a story for awhile now. Its about a girl who was orphaned at a young age then one day a couple adopted her and she went on to be an assassian like her adoptiave parents. She soon realizes that they were the ones who killed her parents and she seeks on getting revenge on them for what they did to her.