In the Dartmoor town of Ashburton, reluctant antique shop owner and accidental amateur sleuth, Juno Browne, has cash-flow problems. So, when the mild and gentlemanly bookbinder, Frank Tinkler, rents a room above the shop, he seems like the answer to a prayer.

At home, Juno accidentally disturbs intruders and shortly afterwards, one of them falls to his death from a viaduct. Was it accident, suicide or murder? When Juno recognises his accomplice as Frank's nephew, Scott, she decides to investigate .