Summary:A mother and father disappear from their home while reading nursery rhymes to their daughter. The son calls the police but it is the mysterious Sapphire and Steel who respond to his call.

Summary:Sapphire and Steel explain the dangers from the forces of chaos lurking in the time corridor.

Summary:Rob plans to escape from the house with his sister, Helen.

Summary:Rob is tempted by voices from Helens room. Sapphire is trapped by the forces of chaos.

Summary:The time agents are joined by Lead, a fellow elemental. Rob is trapped.

Summary:Helen acts as bait to lure the enemy into the cellar.