The third book in Emilia Finn’s Checkmate series is titled “Castling The Rook.” It centers on Riley Cruz, a young, innocent-looking police recruit who is taken advantage of because of his looks. Riley joins an exclusive group of law enforcement operatives that operate on the brink of legality after being hired by powerful figures in the field. In addition to being an agent and a police officer, he juggles his attraction to the irrationally romantic Andi Conner. Riley might be hiding the worst secrets of all as he makes his way through this intricate network.