The sixth book in Emilia Finn’s Checkmate series is titled “Sacrifice The Knight.” It narrates the tale of Eric DeWhit, a guy with an enigmatic past as an undercover agent, and Katrina Blair, a single mother with a strong demeanor. Their paths cross in the restaurant where Katrina works, and what follows is a story of resiliency, second chances, and the potential to tear down barriers caused by previous trauma.