When she first lays eyes on Mya Riley's slashed up body, Baltimore Detective Lisa Swanson is certain that the Sandman, a ruthless serial killer from her past has reemerged. Lisa dives headfirst into the case with her partner Dee, and lovesick Winston Lewis, a detective who grows more captivated with Lisa by the day. The Sandman wreaks bloodthirsty havoc throughout the city, and this time he is determined to make Lisa his victim. Armed with intense hatred for the Sandman and a stifling fear of who might end up dead next, Lisa struggles to solve the case by the book. But when the Sandman switches up his plan and goes after her lover Jake...Lisa ignores all the rules.