Xander Stone has been hiding his three friends the Rainbow-Barfing Unicorns in plain sight as part of a magic show, but now a regular unicorn has found her way through a portal; problem is the virus that turned them into zombie-like creatures has apparently given his three friends a craving for unicorn flesh--so when they all use to the portal to return to Pegasia Xander follows to try and restrain his friends (especially Ronk), and solve the mystery...

Four zombie, rainbow-barfing unicorns were expelled from Pegasia for attempted unicorn cannibalism, but only three of them landed on the mountain where fifth-grader Xander lives with his aunt--but now the unicorns are determined to find their missing friend, Stalor, and when Xander follows them through the portal he finds himself in Shushyerbum, inhabited by Mears with a taste for human flesh, and he not only needs to rescue his friends, but keep...

Just when fifth-grader Xander Stone decides to give up his long search for magical creatures, he encounters three Rainbow-Barfing Unicorns, who were banished from the magical world of Pegasia after an encounter with a mysterious object leaking green gas turned them into smelly, zombie-like, rainbow-upchucking creatures--and Xander will need to keep his wits about him if he is to hide the true nature of his new friends from other humans.