Robbie has disappeared. And, since he'd been asking Saul a lot of questions about time travel, Saul has a good idea where he might have gone...
At school they've been doing a project on the future: will it be full of robots and shiny technology? Or will the environment have been destroyed? The last thing Saul wants to do is go there and find out for sure -- but there's no way Robbie will manage on his own in the twenty-second century.