Jamaica Inn

One day Mary met her uncle's younger brother, Jem. Jem was young and good-looking but he was a horse stealer.

After Mary realizes that Joss is the leader of a band of ship wreckers and even overhears Joss ordering the murder of one of their member, she is unsure whether to trust Jem or not. She turns to Francis Davey. 

Mary and Jem walk together in the town of Launceston, during which Jem sells a horse he stole from Squire Bassat back to the squire's unwitting wife

When it comes time to return to Jamaica Inn, Jem leaves Mary to go get the jingle, but never returns. Mary hires a coach to take her home, but they are waylaid by her uncle's band of wreckers, and the coach driver is killed. Mary is then forced to watch as the wreckers trick a ship into steering itself on to the rocks and then murder the survivors of the crash as they try to swim to shore.  She then goes to the squire's home and tells his wife her story, but Mrs. Bassat tells Mary that her husband already has the evidence to arrest Joss and has gone to do so. Mrs. Bassat has her driver take Mary to Jamaica Inn, where they arrive before the Squire's party. Mary goes inside to find her uncle stabbed to death; the lawmen arrive soon thereafter and discover Aunt Patience similarly murdered. 

After that Mary has an offer to work as a servant for the Bassats, but instead plans to return to Helford but soon she decides to abandon her plans of going to Helford and to go with Jem.