When the owner of an antiques store is battered to death, Detective Sheehan thinks it's just another murder. But when he discovers two keys hidden in an ornamental walking stick, he quickly becomes a target.

Desperate to figure out what criminal enterprise the keys might reveal, Sheehan risks everything to protect them — until his wife Margaret is kidnapped. Events start looking less like coincidence when Sheehan is faced with the fact a mole has been influencing the investigation.

Can Sheehan stop the mole and rescue Margaret before he has to hand over the keys?