Constable Evan Evans is merrily moving his wife-to-be's belongings up to their idyllic mountain cottage when a young hiker knocks at the door. His girlfriend Shannon has vanished somewhere on Mount Snowdon. While out looking for the missing woman, the search party finds something very sinister - a trapdoor in the middle of the woods that leads down to a bunker. With chains and handcuffs hanging from the ceiling . . . Meanwhile, Evans receives a threatening note in the post. Is the coded missive from whoever abducted Shannon? Then his fiancee Bronwen disappears. Who is abducting the women of Llanfair? It's a race against time for Evans and his team to find them before it's too late.