Seventy-seven-year-old Judith Potts lives happily in Marlow, England, setting crosswords for The Times, sipping Scotch, and taking the occasional skinny-dip in the Thames outside her old mansion. When she witnesses a murder, Judith ends up befriending two other unlikely amateur detectives, and the trio of women of a certain age are on the case. This feel-good cozy mystery is a clever, funny, friendship-fueled delight. (CH)