Bobby and Courtney arrive on Third Earth only to find that it has changed quite noticeably. Patrick, the local Traveler, arrives and takes them to the library to find out about their friend Mark, whom they believe is on First Earth. Startlingly, information pertaining to Mark originates from both First Earth and Second Earth. Both sources tell of him disappearing. In the flume, on First Earth November 1, 1937, Courtney and Bobby run into a dado (a type of android) in ragged clothing. Bobby tells Courtney to escape while he fights it off. Soon the dado backs into the tunnel and into an oncoming train. The dado is torn in half. Bobby takes the pieces to the flume and sends it back to Quillan. Then Bobby goes to First Earth to find Mark but he knows that Ibara needs him so he goes there and l