When Sheila Malory reluctantly agrees to help out in a charity shop for a few weeks, her friend warns her about the "control freak" manager Desmond Barlow. It is not without some trepidation that she begins her volunteer work. Before too long, she begins to get the measure of her fellow volunteers, including the bossy Norma Stanley; no-nonsense Jean; and Desmond’s mousey wife Wendy. When Desmond’s lifeless body is discovered after an apparent botched robbery, Sheila finds herself at the heart of the investigation as Inspector Bob Morris seeks her help. As Sheila delves deeper into the lives of her fellow charity shop workers, she discovers long-held secrets and hitherto unknown connections – and perhaps a motive for murder exists after all?