Kat's life is an endless string of Groundhog Days. After her daughter goes to college, there's little left to fill her time. Content and married to a cold-case homicide detective, she is bored. The only colorful part of her week is the neighborhood book club and her friend Ramona's hair. Until she accidentally sees the photograph in her husband's briefcase. Nearly two decades ago, the case shook the community - The MMM Girls. Their mother brutally murdered all three of her young daughters. With DNA advances and a secondary case cropping up, the detectives revisit the case. How can they not see what is clear to her? And if she's right, there's a killer still on the loose. Nosing into a world where she doesn't belong sets in place a sinister chain of events. In the meantime, someone has figured out some of her secrets, too... As bodies pile up, the only way to stop it is to solve the case. A case she isn't supposed to know anything about. Curiosity... what will it do to Kat?