One Mysterious Night

A brilliant, unorthodox detective who relies on wit, improvisation, and charm to outsmart criminals. He suspects inside help, uses clever ruses, and is willing to bend rules to clear his name; resourceful, quick-thinking, and determined.

Blackie's loyal sidekick who contributes in tight spots with loud humor and courage. Though not the sharpest, his courage and readiness to follow Blackie's lead help them escape dangerous situations.

A reporter present at the Farraday office who is quick to pin the crime on Blackie. Her involvement deepens as she navigates between publicity, truth, and the unfolding mystery.

The beleaguered police inspector under pressure to recover the diamond. He uses Blackie's skills as a tool, orchestrating a strategic ruse to trap the crooks while maintaining public face.

Criminal mastermind, partner of Matt Healy, who hides the diamond and collaborates on the heist. Shrewd and ruthless, he is willing to kill to protect the scheme.

A member of the criminal duo who plays a key role in the theft and pursuit. Impulsive and dangerous, he helps drive the plot toward a high-stakes confrontation.

Assistant manager involved with the thieves; initially connected to the gum clue and the hiding of the jewel. His fate intertwines with Blackie's plan.

Daley’s sister who becomes entangled in the scheme and ultimately helps Blackie by passing the jewel, playing a pivotal role in the turning point.

A notorious fence who weighs in on the jewel’s fate, providing expertise and complicating the plan; is shot during the escalating confrontation.