This all-new adventure for Aspen's preeminent hero sees her attempt to navigate an ever-changing world where The Blue are not only present above the surface-but exploited in new and dangerous ways. With her brother Finn suddenly missing, Aspen Matthews takes a deep dive to look for help, arriving in a majestic undersea city. Will she find the allies she so desperately needs, or enemies looking for vengeance? Meanwhile, the mysterious agents who have kidnapped Finn begin a series of unholy experiments to unlock the secrets of his powers!