Sapphire (Joanna Lumley) and Steel (David McCallum) are two detectives on a mission to safeguard the structure of Time. Not human, and not quite alien, the mysterious couple grapple with Time, shown here as an eerie and frightening force. With uncanny powers they protect the present from invading evils of the past and future in a series of unforgettable and mysterious adventures.
Assignment I In a cold and remote house by the sea, a young girl has nursery rhymes read to her by her parents. Downstairs her brother does his homework. One by one the clocks stop and then the grown ups disappear… Assignment II A ghost hunter, Tully, makes contact with the spirit of a WWI Soldier and in doing so arouses the wrath of Darkness, an evil force that feeds off the resentment of people who have died prematurely. Assignment III A couple from the future occupy a time capsule in the present day. Time, resentful and bitter, begins to menace them, transforming their young child into an adult.