In the 12th century many towns were designed and laid out on regular lines. The people of Plympton believe there is enough evidence to plot the layout of the medieval town which surrounds the ruins of their castle, and which was formerly owned by the immensely powerful and wealthy de Redvers family. As usual, Time Team have three days to find it. Back gardens and interiors will provide the clues, rather than frontages which have probably been altered many times in the last 800 years. So they will need plenty of help from local householders. They are joined by Plymouth city archaeologist Keith Ray and dendrochronologist Robert Howard.