When actress Diana Baring is found in a daze beside her colleague’s murdered body, all evidence points to her guilt. During the trial, juror Sir John Menier doubts the verdict, but yields to pressure. Haunted by remorse, he launches his own investigation.

In early 19th-century Cornwall, young Mary Yellan travels to live with her aunt and uncle at the remote Jamaica Inn, where she discovers the inn is a front for a violent gang of wreckers who lure ships to their doom along the coast. As she becomes entangled in their crimes, Mary must fight to survive and uncover the truth behind the terror that haunts the moors.

A card cheat is threatened with exposure into joining a criminal enterprise that Sherlock Holmes believes is controlled by Professor Moriarity.

Set on the Thames estuary, romance blossoms for a young couple.