Something is sickening the unicorns’ magic, and the illness is spreading to neighboring islands. Without unicorns, the magic in Kadmeion’s plate-shaped ocean world will fall into disarray. Just when things could not get worse, Bright’s parents drop by Wuddlekins for a visit. The unicorn problem is nothing compared to what Bright’s aristocratic father has planned for his twice-seventh son.
Kadmeion and Bright must somehow fix the unicorns’ magic, see to an elf-prince’s demands, and make sure that Probability has a wonderful vacation. After all, it is unwise to disappoint the future Lady Luck.