When single mother Tereon Grant's life was suddenly ended in the middle of the night and she was left at the side of the road in North Atlanta, all signs point to her ex-boyfriend. But when homicide detectives David Quinn and Vince Velazquez dig deeper into the case, they uncover a dark secret that changes everything. Quinn and Velazquez are veterans of the Atlanta Police Department. They are sitting down to share some of the grittiest stories of their careers. Quinn and Velazquez recall these cases and talk about their personal experiences while solving the crimes. They have tackled hundreds of cold cases together, with anything from murder to everyday crime, and they try to bring these criminals to justice and give peace to the victims' families.