Duncan Muir is a renowned zoologist, but as well as being a professor at a university, he works for a society investigating sightings and attacks by cryptids.
His latest mission is to Scotland where a marine cryptid is reputedly attacking the local sheep. He takes his faithful friend and right-hand man, Potts, to assist.
However, he finds another mystery when he meets the local laird, Lachlan MacIver. The man's taciturn reputation in the village is at odds with the man Duncan comes to know.
As their relationship develops, the mystery deepens. The cryptids are real. However, Duncan is as equally certain they are innocent of the attacks as he is that Lachlan is in danger.
Duncan must solve the mystery to protect the man he's grown to love.