A shy outcast girl from the rural outskirts of a small town is invited to a girls' sleepover with two other girls. In the middle of the night a horrific fire erupted. By the time emergency services arrived, it was too late. Investigators assumed the parents, their daughter, and her 2 friends died in the home. But only one body was uncovered, the mothers... For years FBI Agent Emma Griffin was largely a lone wolf. She insulated herself from the rest of the world. With very few exceptions. Now, that has all changed. Opening herself has given her a chosen family she loves. Working with her cousin Dean has always made her happy, and now she can help someone find a piece of their family that disappeared years ago. An FBI agent who went undercover and never surfaced. As they dig deeper into his disappearance, they find a potential connection of that case with the mystery of the 3 girls. But as bodies connected to the case turn up in odd locations. Emma struggles to make sense of what happened the night of their last sleepover.