Mallory Reaves

Joey Harker has already saved the multiverse once, but the danger is far from over. In this riveting sequel to InterWorld, Joey is still learning how to navigate his incredible abilities as a Walker, traveling between a trillion alternate Earths. But a new, terrifying threat is rising, and the fragile balance between magic and science is threatening to shatter completely. If Joey has any hope of saving the Altiverse from total annihilation, he is going to have to rely on his wits, his courage, and the help of a mysterious Time Agent named Acacia Jones. Packed with mind-bending space travel, fierce loyalty, and shocking twists, this action-packed adventure proves that Joey is far more powerful than he ever realized.

The multiverse is on the brink of collapse, and Joey Harker is the only one who can hold it together. In this heart-pounding conclusion to the InterWorld series, Joey and his army of alternate selves face their greatest challenge yet. The forces of magic and science have been locked in a brutal war across a trillion alternate Earths, and the balance of power is finally shattering. To save the Altiverse from total destruction, Joey must push his abilities to the absolute limit, risking everything he has fought so hard to protect. Packed with mind-bending dimensions, fierce battles, and incredible bravery, this epic finale delivers a thrilling ride through time and space that will keep you guessing until the very last page.