Tom Tiddler's Island

A young couple Clive and Jean Croft are spending part on their honeymoon on a remote Scottish island. Their enjoyment of the picturesque retreat is soon interrupted by a series of encounters with the other visitors to the island, gun-toting security for an egotistical professor apparently attempting the age-old practice of alchemy to create gold. The arrival of an equally well-armed gang intent on stealing the gold puts the young couple in extreme danger.
With the help of an old university  acquaintance of Clive they attempt to fight back against the intruders.