Looking a book but don't know the title or author

[kcjc0222]

It's a book about a police detective, Nick that saves a woman who is attacked and left for dead in her apartment, Nick and his partner get to the scene and Nick saves the woman and then protects her from the killers, as he is trying to find who it is. They end up falling in love. The book is a 2 in 1 book. The second story is about the woman's brother who is trying to avoid everyone. The his ex-wife is forced to stay w/ him because there are killers after her because they think that she has their drugs. Her son comes and finds her, that's when the hero finds out that his ex-wife's son is really his son. They end up together at the end. I really love this book but I can't remember the title or the author. Can anyone help me?