When a deadly virus ravages the seafood population off the coast of Scotland, the townsfolk of Portree, Isle of Skye, are devastated. Charter boat captain Robin Murphy and café owner Becca Ronan stumble upon evidence that ties the contamination to a pharmaceutical company, thrusting them into a tangled net of mystery. Robin fears—Becca hopes—the Selkies, if they’re real, hold the key. Robin says his priority is finding a cure, but the seal folk he’s befriended on his getaway isle have stolen his heart. Becca's long-lost father and free-spirited mother may save the day…or bring down the ship. As Robin and Becca search for the truth and struggle to keep their businesses afloat, everything is at risk–their love, their beliefs–even their lives.