“Emma Murphy and the Ultimate Power” is an engaging sci-fi book for upper middle grade and young adults. With flawless world-building by the author, readers will easily be transported onto the island—a place of portals, larger-than-life creatures, and extraterrestrial activity. Told from the third-person perspective, the introverted-human-turned-alien-heir Emma shows us what it’s like to be thrust into the unknown and question everything she ever thought true.