I feel like it's 1999

Heartsick - Chelsea Cain

Haven't read a serial killer book in a longgg time - why does it feel like a thing of the 90's to me? This book has a winning, plucky heroine of the 00's (a little more wild and street smart than the winning plucky heroine's of the 90's) combined with a pill popping, haunted, aging detective who's come back out of a forced sabbatical to solve a rash of killings.

This sounds like everything you've read before, and maybe it is, but it's a very enjoyable - read in one sitting - page turner. If you like this sort of thing, definitely worth a read.