Baltimore Detective Lisa Swanson is stunned when Detective Winston Lewis informs her that Devon Barnes, a young man stabbed to death in a park, had her name and number in his phone. Lisa insists she never met or heard of Devon and has no idea why he would have her information. As Winston investigates, he has an eerie feeling that Lisa's information being in Devon's phone connects to his murder as well as a belief that Lisa might be hiding something. Lisa remains adamant that she does not know Barnes, but when her fingerprints show up on the knife used in Devon's murder, Winston finds himself choosing between his feelings for her and doing his duty as a police officer. Pushed into a corner, Winston arrests Lisa for Devon's murder. After Lisa makes bail, she teams up with Winston to find out how and why the evidence points to her as Devon's killer. The investigation leads to Lisa questioning someone from her past who not only could have the answers to her questions, but could also be the reason for her recent nightmare.