Danger in the Last House - Agatha Christie

The first time Miss Buckley's car brakes failed and she almost lost her life, the second time she narrowly escaped when a rock fell near her, and the third time her head was nearly crushed under a heavy board.

Poirot appears at the right moment when a bullet passes near Miss Buckley's head and pierces her hat, and then he decides that the girl needs his protection.

Poirot has begun to solve the mystery of the crime before it happens, so will he succeed in preventing it?