Indian Valley Theatre’s latest production, “Postmortem,” is a fun, witty and suspenseful mystery.

The story revolves around the famous actor William Gillette, best known in the 1920s for his theatrical portrayal of Sherlock Holmes. Gillette has invited the current cast of his latest Broadway revival of Sherlock Holmes to his castle for the weekend, including longtime company members, the troupe’s ingénues, Gillette’s Aunt Lilly and a surprise guest, who has planned a séance for entertainment. It soon becomes apparent someone is trying to murder Gillette and he deduces that it must be one of his guests.

Performances for “Postmortem” will be held at 7 p.m. Feb. 22 and 23 and at 1 p.m. Feb. 24 at the Fox Valley Older Adults Center in Sandwich.