NIGHT SEASON by Chelsea Cain, 2011.

Another pulse-pounding, page-turning thriller featuring Det. Archie Sheridan and reporter Susan Ward. This time around, the Willamette River is flooding Portland and several drowning victims have been found. Yeah, well, what's unusual about these flood victims that they were poisoned and died before they were put into the river. So another serial killer is stalking people in the city, and first Archie's detective colleague Henry becomes a target, and then Susan unwittingly places herself in the killer's path. Thrown into the mix is the discovery of a missing boy, kidnapped several years earlier and who seems to have a connection to the killer, and a skeleton is unearthed that is sixty years old, dating to an earlier catastrophic flood that wiped out an entire town. So many questions: what kind of poison is being used? Why was Henry targeted? Who is the boy that keeps slipping away from custody? What do the tiny keys that are found on each victim mean? And most of all, who is committing these murders and why? Cain keeps the suspense high, weaves her several storylines together admirably and really kept this reader interested. I didn't even miss the fact that Beauty Killer Gretchen Lowell from the previous books is only mentioned in this novel. If you're a fan of crime thrillers, Cain's books (this one is the fourth in the series) are really fast paced and suspenseful. I find them highly entertaining and great reads in between other types of books.