Galaxy Walkers is a middle-grade novel by Kris Paulsen. Lyra Stewart wants nothing more than for her best friend, Archie, to help her with English so she can go on the sixth-grade field trip to the zoo. Within moments, the friends are whisked away by...

In Kris Paulsen's Galaxy Walkers 2: Unity of Worlds, Lyra and Archie are Universe Walkers, humans whose awakened minds let them cross galaxies using extraordinary abilities. Their enemy, Saros, is a Walker who is Archie’s presumed-dead mother. Archie builds a device intended to stop her...