The gimmick to accompany the conclusion of the Princess Diaries is this delightful historical romance written by series heroine Princess Mia Thermopolis (with help from Cabot, who is donating all proceeds to Greenpeace). Finn Crais is the resourceful daughter of a miller living in Stephensgate, England, in 1291. When Finns older sister, Mellana, gets pregnant by a troubadour and has no money for a dowry, Finn agrees to carry out Mellanas ridiculous plan to abduct a wealthy man and hold him ransom, settling on Earl Hugh Fitzstephen, fresh back from the crusades and loaded with gold and jewels. Finn doesn't realize who it is she'scaptured, and Fitzstephen, owing to a curiosity about Finn and wanting to see where the kidnapping will lead, plays along. As to be expected, passions become enflamed, and Finn discovers her sister's plan may not be a simple as she originally thought. Though predictable, the novel is thoroughly enjoyable and funny. Cabots fans, and particularly those graduating from the Princess Diaries, will be pleased, especially as they may have read brief excerpts in Forever Princess, the series finale (Reviews, p. 55). (Jan.)