At Bertram's Hotel

At Bertram's Hotel is a mystery novel by Agatha Christie, first published in the United Kingdom by the Collins Crime Club on 15 November 1965 and in the United States by Dodd, Mead and Company in 1966. It follows Chief Inspector Fred Davy as he investigates an upmarket hotel at the centre of a mysterious disappearance.

Miss Marple is among the guests and the book was marketed as one of her novels, although she appears in only a few chapters and has an almost completely passive role in the investigation, which is an unusual arrangement for the series. Her holiday frames the opening, since the hotel presents itself as a survivor of an older London, and the novel's tension comes from how carefully that impression is maintained.

Reviews were mostly positive. Critics objected to the reliance on coincidences, but found the writing strong enough to carry the book despite the weaknesses in the plot. Christie had by this point been publishing for more than forty years, and the novel belongs to the later part of her career, when the settings and the social detail are as important as the puzzle.