Many new mysteries this month. “Closed Casket” is a new Hercule Poirot mystery by Sophie Hannah. Expect many clues and red herrings to tease the little grey cells. “Revenge in a Cold River” by Anne Perry finds Inspector Monk the prey, as a rival attempts to exploit Monk’s amnesia to ruin his reputation. “Behind Closed Doors” by newcomer B. A. Paris is “the most emotional and intriguing psychological suspense thriller you can’t put down”. It says so on Amazon.com. The “Razor Girl” in Carl Hiaasen’s new tongue-in-cheek thriller is a crash scam artist who may hold the key to restoring a disgraced detective’s reputation. “Liar’s Key” by Carla Neggers is a convoluted tale about art theft and murder.