''Sleepyhead'' is a serial-killer novel, set in the contemporary London and featuring DI Tom Thorne as the main character. It was Mark Billingham's debut as a crime writer and was received very well. I have enjoyed the novel, but I think that it had a lot of faults of the typical debut - I have now read the other instalments of the series and there are better ones out there, my favourite being [[Scaredy Cat]] (this was one that really scared me and it's not an easy feat for a pop-book!).