"I Know a Secret" does not disappoint as Tess Gerritsen's latest Rizzoli and Isles novel. Weaving together both Jane and Maura's points of view, as well as that of a third person who remains unknown until the denouement, Gerritsen keeps the reader's interest captivated. Current murders turn out to be eerily symbolic and tied to another crime that occurred two decades earlier. How they are related has profound consequences on both the past and the present, revealing that not everyone is who they seem to be. This is another great page-turner from a well-established master of the genre!