McGill rescues depressed aristocrat's son Tim Gormond when he attempts suicide by jumping off the Albert Bridge into the Thames. Tim feels guilty because a friend of his died by falling from the bridge and believes he was the only witness. However the dead man's girl-friend Annabelle was also present and is bound up in the reason for the death. Her wealthy father Sir Walter Fenchurch is anxious that Annabelle should not be involved and tries to bribe McGill to prevent this .
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