It’s tough to get in touch with your granddaughter when you’re dead, so interior designer Ellie Haskell’s late grandmother Sophia enlists the help of Rosemary, Thora, and Jane, three surviving friends Ellie (The Trouble with Harriet, 1999, etc.) calls “the bridesmaids,” to summon her and her housekeeper Mrs. Malloy to the Cambridgeshire village of Knells for a séance that will reveal a long-unsolved murder, and a still-active killer.