Heart must solve the riddle of Castle Avamir, which is, among other things, "deep in a valley" and "over the moon, " in order to find a safe haven for the unicorns as the Gypsies leave Lord Levin's mountains for Lord Kaybale's plains.
year: 2003
call number/section: 1000
subjects: unicorns, fiction, foundlings, castles, riddles