Quinn (the Mindjack trilogy) introduces Finn, a bullied 14-year-old new to England, who is intent on keeping himself and his younger sister out of foster care, due to an absentminded father. Complications arise when Zaneyr, a faery prince from the Otherworld, swaps souls with Finn as a way to escape his dangerous father, king of the Otherworld. Finn soon realizes that the only way to retrieve his soul before the solstice is to help Zaneyr in his plot to overthrow the king before a rift opens between the human and Otherworld, leading to mass destruction. Surprised by the knowledge that Finn’s father is a long-lost brother to Zaneyr—making Finn part faery himself—Finn relies on his own abilities to win dissenting faeries to his side and entrap the king. Quinn’s elaborate novel, which shifts focus between Finn and Zaneyr, teems with action and suspense. Yet the logic of the magic used and its relationship to mathematics can be confusing, and characters are often forgotten or dropped, detracting from an otherwise promising tale. Ages 8–12. (BookLife)