A Scotsman abruptly breaks off his engagement to pretty Kitty and moves to his uncle's castle in the Scottish highlands. Kitty and her aunt follow Gerald a few weeks later, and discover he has suddenly aged. Some mysterious things happen in a maze made from the hedges adjoining the castle.

Bookkeeper Sam Wilson learns from his boss, Malcolm Jarvis, that he is losing his job because the company is closing down. Jarvis then makes a strange proposition, saying he intends to commit suicide but wants Sam to make it look like a murder, in order for his wife and son to inherit Jarvis's life insurance. Sam declines, but when he goes to see Jarvis and finds his dead body, he reluctantly goes along with the scheme.

Blind detective Duncan Maclain gets mixed up with enemy agents and murder when he tries to help an old friend with a rebellious stepdaughter.