Speak of the Devil

SPEAK OF THE DEVIL by Allison Leotta. When Anne Curtis, prosecutor for the government, gets the case to prosecute the devil her life turns upside down.  Anne gets engaged to Jack and her life seems perfect until she becomes a target of the devil or diablo. Diablo is the leader of one of the meanest gangs around and he wants to get rid of Anne before he gets convicted of many terrible crimes.  The only person diablo wants more is the person who has turned informant and he wants to find out who the snitch is.  The drama and surprises are great.  It isn't a "who dunnit" but there are surprises in the story.