As a Miss Marple novel, At Bertram’s Hotel is a dud. It’s a detective novel that doesn’t allow its hero to solve the crime. Miss Marple does some eavesdropping and makes a couple of deductions at the same time as a police detective, but never gets to tell him anything he doesn’t already know. At one point she plays the role of the witness amazed when the brilliant detective explains the surprising truth behind what she saw. That’s just backwards.

What makes At Bertram’s Hotel interesting is what Miss Marple does while she’s failing to detect. Bertram’s Hotel caters to elderly guests who want an environment that reminds them of their youth, and tourists who want to see the London of fifty years ago. Christie belabors how Bertram’s serves proper muffins and poached eggs and seed cake. The rooms are done up in tasteful archaic styles, camouflaging their modern fittings. The staff resemble the happily efficient servants who only ever existed in P. G. Wodehouse novels. The guests resemble the aging gentry who only ever existed in… um, Agatha Christie novels. During her stay at Bertram’s Miss Marple shops for the plain old-fashioned dish towels she has trouble finding nowadays, and visits places she remembers from her youth.

But Miss Marple finds that most of the places she remembers have changed or been built over. Bertram’s out-of-time fittings begin to look unnatural. Even the guests don’t look quite how she expects elderly people to look in the world of 1965. She concludes “that one should not ever try to go back–that the essence of life is going forward.”

It’s generally an error to assume an author’s biography has anything at all to do with her writing. But in this case it’s tempting to draw conclusions from the fact that, when At Bertram’s Hotel was published, Agatha Christie was 75 years old, near Miss Marple’s age. At Bertram’s Hotel feels like Christie letting herself indulge in nostalgia for the old days, then spending the rest of the novel gently scolding herself for doing so.