Death stalks the guests at a seaside resort... While staying at Brighton with the formidable old Mrs. Montford, Anna Fairweather witnesses a drowning. Suspecting the "accident" is something more sinister, Anna begins a search for the truth - and the killer. Does a belligerent brother-in-law carry an old grudge? Is the victim's grieving husband a little too quick to move on? With an entire hotel full of suspects, Anna must uncover the secrets, and the motives, the hotel guests and employees are desperate to hide. But with the clock ticking, will Anna get to the bottom of the mystery - or find herself at the bottom of the ocean?