Meet eleven-year-old Dori Lowry, a fifth grader facing a major dilemma - she's the only one without a unique soul mark. While everyone around her flaunts halos of flowers, crystals, and grass, Dori feels like the odd one out. Determined to uncover the truth, she turns to the mysterious Silis Madden, a classmate with an extraordinary mark that's out of this world.

But that's not all Dori has to deal with. Her home life takes a wild turn when her mom's new boyfriend, Benjamin, moves in. And when Benjamin's own soul mark triggers a strange event, Dori discovers her newfound ability to see creatures from another realm. As chaos ensues and a mysterious creature infects soul marks, Dori must unravel the secrets of soul marks, the enigmatic Madden family, and the otherworldly forces that threaten to engulf her world.