Man who want to solve a mystery that could affect his life, but has a plot twist at the end. YA, mystery, romance. Spoiler.

[Cecy]

The book turns around the process of a man that wants to solve a mystery that threatens his life, I don't remember if the man is a novel writer, a journalist, or something similar.
(view spoiler)[In the end, he is walking or running when a group of runners passes on his side and someone attacks him, who result be a person that he knows.. (hide spoiler)]
I read this book for almost 4 years, and I think that the cover is white with a little blue and has an image of a man, but I'm not sure about it.
That's all I can remember

[Rainbowheart]

Are you sure this is YA?

Is the main character an adult male?

[Cecy]

Sure at 100%, no. And yes, he´s a male adult.