Originally released as part of a single volume, An Invitation is book one of the dualogy Seabird, the first of Thompson's epic series The Narentan Tumults. Seabird takes the reader on a perilous adventure, where deadly creatures and magic untold wait at every turn. Three deadly sorcerers have been released from their imprisonment by the evil Lord Thaddis. The Three Peoples of Narenta are in need of a champion to defend them from the sorcerer's threat. They get their champion in the person of reluctant teenager Cara Marshall, who wants nothing more than to go home. Will Cara overcome her fears and reservations and save Narenta?