Dearly Devoted Dexter by Jeff Lindsay

Dearly devoted Dexter  - Dexter Morgan has been under considerable pressure. In trying to avoid the deep suspicions of the dangerous Sergeant Doakes-who believes Dexter is a homicidal maniac (which, of course, he is)-Dexter has had to slip further into his foolproof domestic disguise. While not working as a blood spatter analyst for the Miami Police Department, he now spends nearly all his time with his girlfriend, Rita, and her two children. But how long can Dexter play Kick the Can instead of Slice the Slasher?