John Verdon, the internationally bestselling author of Think of a Number and Shut Your Eyes Tight, is making retired NYPD homicide detective, Dave Gurney, work harder than ever in Let the Devil Sleep, his third mind-boggling puzzle masterpiece which will keep readers up all night. Ten years ago a serial killer went quiet - now he's back... Dave Gurney, a retired NYPD homicide detective, agrees to meet a young woman making a documentary on The Good Shepherd. A decade ago a series of roadside shootings and a manifesto raging against the rich made The Good Shepherd killer headline news. But then the killings stopped, and nobody could say for sure why.

Finding himself drawn back into the case, Gurney soon discovers new facts the original investigation missed. More troubling, it seems that someone is aware of his interest and they are not happy: a razor-sharp hunting arrow lands in his yard, and he narrowly escapes injury in a booby-trapped basement. Realising that this is one killer much too clever to ever be found, Gurney literally stakes his life on finding The Good Shepherd. He makes himself a target so that the killer will come for him...