Mrs. Aylwood is a distraught mother since her daughter, Karen, vanished in the Welsh countryside 30 years ago. When the Carstairs family move into the Aylwood manor for the summer., strange occurrences begin to unnerve the family and Jan begins to suspect that they are linked to Karen's disappearance. As Jan unravels the dark past hidden by the townspeople, she delves further into the mystery and deeper into danger, but now it might be too late to escape the Watcher in the Woods.

A gang of hijackers led by Ray Petrie (Ian McShane) seize a British plane as it is landing in Scandinavia. Ruthless military police chief Colonel Tahlvik (Sean Connery) is assigned to rescue the plane and its passengers. But he must also deal with the problem of the British Ambassador, whose residence has been seized by a second group of terrorists.