Showing Agatha Raisin and the Love From Hell by M. C. Beaton

Recently married to James Lacey, Agatha quickly finds out that love is not all its cracked up to be - the newly weds are living in separate cottages and accusing each other of infidelity. After a fight down the local pub James vanishes - a bloodstain the only clue to his fate - and Agatha is the prime suspect. Determined to clear her name and find her husband, Agatha begins her investigation - and promptly finds a murdered mistress...