Triangulate: Book Three of The Stones of Bothynus Trilogy is the final book in D.K. Reed’s young adult science fiction/fantasy trilogy. Annie is obsessed with the half-angel Aaan but this summer she only has two weeks to spend at her grandmother’s farm, near Aaan’s cave, before flying to Budapest to visit her childhood best friend. She convinces Aaan to leave his cave with her but their short-lived acquaintance may be over when he agrees to allow Erik to use him to test how the stones affect angels, without realizing this would make him vulnerable to Daanak and the fiend. The visible battle is only the tip of the iceberg for the larger battle that rages in the Angel Realm.