First of all, is this really what retirement looks like?

If so, perhaps we should all sign up, no matter our age. In “The Thursday Murder Club,” an amiable, cozy, pleasantly entertaining adaptation of Richard Osman’s mystery novel, the lucky club members live in a retirement home that resembles Downton Abbey.

The food at this dreamy manor house nestled in the English countryside is scrumptious, with a choice of wines at lunch. The apartments are huge, the antiques tasteful, the archery and life-drawing classes top-notch. And the emotional support animals are llamas. Yes, llamas.

This is the setting, quaintly called Coopers Chase, in which four retirees, led by Helen Mirren in her no-nonsense plaid blazers, depart from yoga and Sudoku each week to consider cold cases. Old folks solving c

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