Warned that it is haunted, a skeptical young couple buy a rundown yacht and fix it up to be their home-on-the-sea, only to slowly realize that it really is haunted.
Production
Real ship locations give claustrophobic authenticity.
Acting
Hazel Court elevates every scene she's in.
Writing
Tight mystery structure — Agatha Christie at sea.

Director
Vernon Sewell
Trivia, insights & behind the scenes
Director Vernon Sewell made this twice: a 1939 short film version, then this 1952 feature with expanded plot.
Hazel Court became Hammer Horror royalty shortly after this — this is her ghost origin story.