David Ellis 
Breach of Trust [EPUB ebook] 

Jason Kolarich does not believe he will be around to see this story told.A witness from a past case, whom Jason had persuaded to testify, has been murdered. Was it Jason’s fault?As he wrestles with his own feelings of guilt, he becomes increasingly involved in an obscure agency which at first seems to hold the answers. But he is soon in the centre of a complex conspiracy. Forced to become a federal informant, he has no idea how deep the corruption goes, and can see no clear way out. Will Jason prove to be a help to the feds, or a dangerous live wire?