A serial killer is stalking the elderly of Southbourne. The only clue left behind is a domino in the hand of each victim - with a name scratched on the back. Eighty-six-year-old Sarah Brown is found dead in her hallway one morning by her delivery man. She was stabbed in the back. Fiona, Sue and Daisy, volunteers at the local charity shop, Dogs Need Nice Homes, can't believe their favourite customer is dead. The ladies vow to bring the killer to justice. With plenty of tea and cake along the way, and despite squabbles with their rivals, the Cats Alliance across the street, the Charity Shop Detective Agency is born.