I can't seem to recall the name of a book. I remember it was urban fantasy. Set somewhere in Europe. Anyways, the girl meets this group of people who are compelled to help people. Anyways, when they killed helping someone they are reborn. There was also character named jean something who's their mentor. There's also a scene involving a subway accident its minor but that's all I can remember. She later finds out that he's this long dead firefighter from a newspaper article. The characters are all in their teens. Ok, that's all the details I remember.
The cover had a picture of this girl in a red dress. The book wasn't particularly good, which is why I can't remember it. It's like a puzzle I can't solve. I know I'm not making much sense, but please help.