"The DV Code" is a very entertaining thriller, but completely throwaway. If you liked "Sleepyhead" try Mo Hayder's "Birdman" (very sick) or Michael Marshall's "The Straw Men" and/or "The Lonely Dead". A bit more of an "out there" suggestion is any of Phil Rickman's "Merrily Watkins" mysteries. (I love them and wish more people would read them). They follow Merrily Watkins, single mum, vicar, and (by Book 2) exorcist through various criminal/supernatural adventures. Very easy to read and exciting. The first book is "The Wine of Angels", but while it helps to read them in order, it's not 100% essential. They're not that well known, so you may have to go to a fairly large store to find them.