Private Investigator Agnes Trout is seeking balance in her relationships when an old friend in England asks for help locating his aunt, who went missing over eighty years ago. Agnes relishes immersing herself in a new missing person case, but complications arise when human bones surface by her friend's canal barge home. A brutal decades-old murder unravels, plunging Agnes into a quest for answers across England and South Wales. She is joined by her intriguing new partner Jonathan Black, and the search also leads Agnes to revelations closer to home.