In coastal Southbourne, a serial killer stalks residents, leaving the only clue in each victim's hand - a domino with a name scrawled on it...

Fiona, Sue and Daisy are three charming retired ladies who work in a small charity shop. One day, the measured rhythm of their lives with coffee Tuesdays and walks along the lovely streets of Southbourne is disrupted by the brutal murder of their beloved client.

Not wanting to put up with such injustice, they take the investigation into their own hands. Moreover, a new body appears, and the police cannot move from the dead point. Armed with extensive knowledge gleaned from detective stories and, of course, tea and excellent muffins, three dear old ladies begin to take action.

This is how the “Charity Shop” detective agency appears.