Martha Jones is a bit tired of walking around in circle with the Tenth Doctor, who is using a small hand-held device to track an etheric beam in a busy town high street. She decides to take a break and grab a coffee. It's a beautiful summer day and the Doctor is happy to head off on his own, leaving Martha to take a seat. As Martha sits with her coffee and cake, she watches people going about their everyday lives and notices the repeated appearances of an old lady. Nothing special — an old lady, white hair tied up with a pin, brown cardigan and black handbag. Yet whenever she sees her, the same old lady is somewhere else, walking one way then the other, going in one shop and out another. At one point she sees the Doctor nearly knock her into the road as he blindly tries to track his signal