Filmed as The Sea Wolves, this is the story of the undercover exploit of a territorial unit. The Germans had a secret transmitter on one of their ships in the neutral harbour of Goa. Its purpose was to guide the U-boats against Allied shipping in the Indian Ocean. There seemed no way for the British to infringe Goa's Portuguese neutrality by force. But the transmitter had to be silenced. Then it was remembered that 1,400 miles away in Calcutta was a source of possible help. A group of civilian bankers, merchants and solicitors were the remains of an old territorial unit called The Calcutta Light Horse.