Some decisions have unimaginable consequences. Every time someone makes a choice, a new parallel world is spun off the existing one. Eating breakfast or skipping it, sneaking out instead of staying in bed—every decision creates an alternate universe in which an Echo self takes the road not traveled. As a Walker who can navigate between these realities, Del is training to help keep the dimensions in harmony. When Del secretly starts to investigate other dissonant worlds, she get tangled up with an Echo of her longtime crush. She knows she shouldn't keep seeing him. But as Del persists, she uncovers a truth that the Council of Walkers is trying to hide—a secret that threatens the entire multiverse.

Del’s older sister can also walk between worlds, but her loyalties are uniquely tested in this original enovella set in the inventive world of Dissonance. Addison Sullivan, Del’s older sister, has always been considered a model Walker—but her reputation within the Consort has been tainted by her grandfather’s betrayal and her sister’s recklessness. She is desperate to regain her position within the Consort and equally desperate to keep Del from spiraling out of control after losing the boy she loves. The Consort offers Addie a chance to redeem herself: if she can track down the Free Walkers her grandfather knew twenty years ago, they’ll fast-track her apprenticeship and put her in charge of her own team. Addie asks a former classmate and crush, Laurel, a Consort historian, for help. As they work together, Addie’s feelings for Laurel resurface, but she’s too afraid to act. Same-sex relationships aren’t expressly forbidden by the Consort, but she fears that a relationship with Laurel would be viewed as yet another mark against her. While she is fighting her feelings for Laurel, troubling details start emerging during their investigation…details that paint Addie’s family in a sinister light. Will she reveal what she’s learned to the Consort, or try to protect her family? This enovella is set in the time between Dissonance and Resonance.

As a Walker between worlds, Del is responsible for the love of her life—and the fate of millions—in this thrilling sequel to Dissonance. Del risked everything to save Simon, and now he’s gone, off in another world with no way for Del to find him. She’s back at the Consort—training to be a Walker like everyone in her family. But the Free Walkers have other plans for her. This rebel group is trying to convince Del that the Consort is evil, and that her parents are unwittingly helping the Consort kill millions of people. The Free Walkers make Del the ultimate promise: if Del joins their fight, she will be reunited with Simon. In agreeing, Del might be endangering her family. But if she doesn’t, innocent people will die, and Simon will be lost to her forever. The fate of the multiverse depends on her choice...