Kat, a young librarian, surrounds herself with books. When Kat's neighbour, Dusty, clears out her attic she comes across a valuable ring, seemingly plucked from Loch Assynt more than fifty years ago. The ring is engraved with the romantic plea 'Marry me Jess? Love Hamish'. Kat is pressed into returning to the remote village with Dusty, in an attempt to return the ring to its rightful owners.

On their way to the Scottish Highlands, Kat and Dusty pick up hitchhiker Logan – a forensic psychology student who is determined to make his mark as chief investigator.

This unlikely trio of teenager, grandmother and student, has three days to uncover the mystery of the engagement ring.

One weekend. One ring. One chance to find its story.