For almost fifty years, Katie has kept a box of secrets. It dates from her time working as a nurse in a west of Ireland mother and baby home, and contains a notebook with details of the babies and young women she met there. It also holds many of the babies' identity bracelets. Following the death of her husband, Katie makes a decision she has long kept at bay. She posts a message on an internet forum, knowing that the information she possesses could help reunite adopted people with their birth mothers. Soon, the replies are rolling in, and Katie encounters success, failure, heartache and joy as finds herself in the role of part-detective, part-counsellor - chasing down leads, piecing together stories, and returning many of the bracelets to their original owners. But there is one bracelet in the box that holds the key to a story that may never be told...