Detective Rain Huxtable works alone, and she likes it that way. But when a fourth spouse turns up dead in Lincoln, Nebraska, Rain's superiors call in help from the FBI. They've either got a serial killer or a hired murderer on their hands, and their solution is to team Rain up with Special Agent Noah Kayne - and send them undercover as a married couple.

Noah is infuriating - and infuriatingly attractive. Rain wants no part of this charade, but with four people dead under suspiciously similar circumstances in a matter of months, she has no choice but to play the part of a doting wife and investigate a close-knit group of suburban couples. It's hard enough to keep up a professional facade when the heat between her and Noah burns so dangerously. But it may be even more dangerous for Rain to let her guard down once she realizes that the couples involved are playing a very sordid - and deadly - game.