I had not previously read any of Catherine Coulter's novels. My introduction to her writing came via Double Take, the 11th book in her FBI Series.
FBI agents Dillon Savich and Lacey Sherlock, married to each other, are at the core of the mysteries in this series. Yet, if I had not checked Coulter's website for some background, I would have seen them as just two of the "good guys" in this novel. It seemed to me that Special Agent Cheney Stone and Dixon Noble, a sheriff from Virginia, played more prominent roles in solving the 2 mysteries in Double Take.
Actually, it just seems like there are two separate stories here. Coulter very ably starts with what appears to be 2 unrelated investigations on opposite coasts and gradually weaves them together until we see at the end that there is a single source of the evil perpetrating the initial crimes.
It is highly likely that I will read other novels in Coulter's FBI Series. She does say on her website that they can be read in any order. Knowing how obsessive I can be, I'll probably go back and start at the beginning.