As the Isle of the Four Kingdoms series continues in "Book Three - Whose Land?," Princess and sorceress Toosweet Filly's guardianship of the Blue Dragons is challenged when one of her beloved dragons is maliciously attacked and killed by marauding, cross-kingdom, renegade dragons. Vowing to seek justice for one of her own but knowing her first responsibility is to protect the dragons, Toosweet must devise a way to protect each colony of dragons. . . and not just the blue dragon's colonies, but every dragon colony on the isle. In her journey to create a protection plan, she becomes aware of further unrest in the kingdoms and the scope of her plan must be broadened. It must not only provide protection for the dragon colonies, but establish provisions for their homes, and ultimately, lead to peace between the isle's dragons, as well as peace with the warm-bloods, the people of the isle. Calling for assistance from her mates and mentors from her Sorcery Academy days, the four Kings of the isle, and the 'Knight Squad', she readies them for their quest. Just as the quest begins, it is thwarted with the news that the renegade leader's goal is to systematically rid the isle of humans. Toosweet must redirect the quest and eliminate this threat to the survival of the isle's inhabitants. Is she prepared for such a challenge?