Detective Nick Belsey is trying to behave. Which means no more boozing, no more thieving, and no more abuse of the badge. It's hell. Then someone sets him a riddle. How does a man walk into one of London's million dead-end alleys and never come out, only to reappear in another part of town to cave in a homeless man's skull? In DEEP SHELTER, Besley dives headlong into London's darkest terrain.