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Inspired by author P.M. Hubbard's novel of the same name, this intense installment of ITV's "Armchair Thriller" series stars Ian McShane (Deadwood) as a recently-paroled ex-con seeking to solve a deadly mystery. Four years ago, Peter Curtis (McShane) killed a man. Before slipping away, his victim uttered the words "High Tide's at 9.53." Haunted by the mystery of those final, fleeting words, Curtis travels south after serving his sentence, and checks into a West England hotel to search for answers. Chillingly, the only other occupant of the hotel seems to know everything about Curtis despite the fact that they've never met. Not only that, but the locals know exactly why he's there, and they're not about to let him solve the mystery first. Now the closer Curtis gets to the truth, the more likely it becomes that he won't live to see another day.