A beloved film star's murder on a train sets a determined local reporter on a path of escalating danger and intrigue. Gerald Hennessey, a famous actor, is found dead on the 4:30 from Paddington, his intended arrival in the quiet town of Temple Regis disrupted by his demise. Reporter Judy Dimont of The Riviera Express begins to investigate, only to discover a second victim, Arthur Shrimsley, in what appears to be a suicide. Dimont must uncover the connection between the two men and the reason for Hennessey's visit to Temple Regis, all while navigating the skepticism of her editor, Rudyard Rhys.

This novel is celebrated as a satisfying addition to vintage crime fiction, featuring a compelling and dignified amateur sleuth in Miss Judy Dimont. Critics highlight its gentle humor, eccentric protagonist, and old-fashioned whodunit structure, suggesting it is the first in an entertaining series. The book is described as 'unashamedly cosy' and 'tremendous fun,' with praise for its 'delicious adventure' and the promise of more compelling mysteries to come from the author.