A body found washed ashore on England's south coast leaves investigators stumped, but service records on the dead man's Rolex watch lead to the discovery of his identity: Ronald Platt. Knowing that, detectives track down his business partner, Albert Walker. A police officer visits Walker's residence, where a neighbor indicates that a "Ronald Platt" lived in the house and describes the man---with words that match Walker's description, leading to Walker's arrest for murder.