An eclectic group of characters set sail on Captain Lansen’s leaky cargo ship in an attempt to escape their various troubles. When a violent storm strikes, the ship is swept into the Sargasso Sea and the passengers find themselves trapped on an island populated by man-eating seaweed, giant crabs and Spanish conquistadors who believe it’s still the 16th century.

Fresh-faced young Michael Rimmer worms his way into an opinion poll company and is soon running the place. He uses this as a springboard to get into politics and in the mini-skirted flared-trousered world of 1970 Britain starts to rise through the Tory ranks.

It took Peggy Heller a long time to recover from the trauma of a brutal physical assault, suffered in her youth. When she married Robert, he provided her with the love and reassurance she craved for and the two settled down in a pretty house in the grounds of the public school where Robert was a master. But the headmaster of the school is not what he seems and Peggy is convinced he means to harm her - is her fear a figment of her tortured imagination or are there forces at work that intend to manipulate her anxieties with fatal consequences?

When a government official disappears in the London tunnels, after several reports of missing people in the same location, Scotland Yard start to take the matter seriously, along with a couple who stumble into a victim by accident.