Marcus Graham had left no forwarding address and was pursued by half a dozen impractical tracer-robots dug up by the police lab. They were accompanied by their impractical inventors to various parts of the solar system. In the meantime, Marcus Graham had arrived on Ganymede where Powell located him at an auction of rare primitive books conducted at breakneck speed by a peeper auctioneer. The books had been part of the Drake estate, inherited by Ben Reich from his mother. They had been unexpectedly dumped on the market.