21st-century journalist Olivia Watson thinks traveling back in time to 1934 to attend a Halloween party with her friend Detective Steven Blackwell will be a lot of fun. And it is...until she witnesses the head of the Shipley Five-and-Dime empire murdered, and fears the killer saw her face.

The smart move is to return to the safety of the present, but Olivia possesses a secret and is about to defy the unwritten rules of time-travel. She convinces Steven to let her stay in his time and help unravel the motives behind the murder, even if it means risking her own life to save another.

When Steven delves into the investigation, he discovers how a bitter relationship, a chance encounter, and a fateful decision converged to set the stage for murder. In a maze full of unreliable clues and misdirection, dark secrets refuse to stay buried and forgotten ghosts won't fade away. Steven is reminded that old sins cast long shadows.

Can Steven catch the killer before time runs out for Olivia?