The Likeness is the second book by Tana French. It follows In the Woods, the first book in the “Dublin Murder Squad” series. You don’t absolutely have to read In the Woods before you pick up The Likeness, but, readers who skip the first one will miss out on some background information.
The main character in this book is Cassie Maddox, who was one of the detectives in the last book, working on Operation Vestal, with her partner, Ryan. Now, it’s six months later, and Cassie has left the Murder Squad, to work in a department that mostly handles domestic disturbances.