Escape Through A Crack In Time: Part 6

T1, E6: Lured by a vision of his father, Rob walks into a trap in the basement. A pool of light has taken him back in time to the 1700s when the house was first being built. Sapphire and Steel fear the worst when they discover that all three pools of light are there in the trap with Rob. However, Steel decides to gain the upper hand by using Helen as bait.