Crossover is the first novel in a series which follows the adventures of Cassandra Kresnov, an artificial person, or android, created by the League, one side of an interstellar war against the more powerful, conservative Federation. Cassandra is an experimental design - more intelligent, more creative, and far more dangerous than any that have preceded her. But with her intellect come questions, and a moral awakening. She deserts the League and heads incognito into the space of her former enemy, the Federation, in search of a new life.

On a cold spring night in 1952, a huge meteorite fell to earth and obliterated much of the East Coast of the US, including Washington, DC. The ensuing climate cataclysm will soon render the Earth inhospitable for humanity, as the last such meteorite did for the dinosaurs. This looming threat calls for a radically accelerated effort to colonize space and requires a much-larger share of humanity to take part in the process. Elma York’s drive to become the first lady astronaut is so strong that even the most dearly held conventions of society may not stand a chance against her.

Inheriting your uncle's supervillain business is more complicated than you might think. Particularly when you discover who's running the place. Charlie's life is going nowhere fast. A divorced substitute teacher living with his cat in a house his siblings want to sell, all he wants is to open a pub downtown, if only the bank will approve his loan. Then his long-lost uncle Jake dies and leaves his supervillain business (complete with island volcano lair) to Charlie. But becoming a supervillain isn't all giant laser death rays and lava pits.

Few people know the name Vesper Quill. To most folks, I’m just a lowly lab rat who designs brewmakers and other household appliances in the research-and-development lab at the powerful Kent Corp. But when I point out a design flaw and a safety hazard in the new line of Kent Corp spaceships, everyone knows who I am—and wants to eliminate me. I might be a seer with a photographic memory, but I don’t see the trouble headed my way until it’s too late. Suddenly, I’m surrounded by enemies and fighting for my life.

When half of mankind revolts and demands more opportunity, those at the top decide on a compromise: They will build the first colony ships and allow the rest to discover new worlds and start over. Twelve ships are built. The first is called the Orion. Many are eager to go, but only 100,000 are chosen for each vessel. Far from Earth, a new life awaits, and it promises the prosperity they've always wanted. But still, resistance stirs.

Colton Beck has six months to live. He works for the Angor near Los Angeles, aware that any day could be his last. The Angor arrived twenty years ago, resolved to help mankind survive, but not everyone believes their motives are honorable. When the Angor offer humanity a colony world, Colton is determined to see another planet before his final breath. He's been diagnosed with Xeno, a rare disorder that surfaced with the Angor's arrival, but he won't let this stop him.

Our universe is ruled by physics, and faster-than-light travel is not possible - until the discovery of The Flow, an extradimensional field we can access at certain points in space-time that transports us to other worlds, around other stars. Humanity flows away from Earth, into space, and in time forgets our home world and creates a new empire, the Interdependency, whose ethos requires that no one human outpost can survive without the others. It's a hedge against interstellar war - and a system of control for the rulers of the empire.

Rhode Island, 1846. Estranged from his family, writer Merritt Fernsby is surprised when he inherits a remote estate in the Narragansett Bay. Though the property has been uninhabited for more than a century, Merritt is ready to call it home—until he realizes he has no choice. With its doors slamming shut and locking behind him, Whimbrel House is not about to let Merritt leave. Ever.

Leiyn “Firebrand” is no stranger to a fight. A brash ranger of the Titan Wilds, she takes up her bow to ward against the colossal spirit creatures known as titans, ever a threat to the colonies she has sworn to protect. But no amount of skill can guard against treachery. When tragedy strikes the rangers’ lodge, Leiyn vows to avenge the fallen. But if she is to succeed, she must embrace a power within her she has long denied. Power to move mountains and rivers. Power over life and death.

Before he led Ravka’s Second Army, before he created the Fold, and long before he became the Darkling, he was just a lonely boy burdened by an extraordinary power. Eryk and his mother, Lena, have spent their lives on the run. But they will never find a safe haven. They are not only Grisha—they are the deadliest and rarest of their kind.

Joe Colsco boarded a flight from San Francisco to Chicago to attend a national chemistry meeting. He would never set foot on Earth again. On planet Anyar, Joe is found unconscious on a beach of a large island inhabited by humans where the level of technology is similar to Earth circa 1700. He awakes amid strangers speaking an unintelligible language and struggles to accept losing his previous life and finding a place in a society with different customs, needing a way to support himself and not knowing a single soul.

On a little-known planet, Archmage Varic Vallenar casts a grand spell to empower himself with the magical abilities of his alternate selves. The ritual works too well, granting Varic not only the magic but also the memories from six lives. Including their gruesome deaths. Now, Varic has power greater than any wizard in galactic history, but he knows that won’t be enough. The enemies he faced in those alternate lives were apocalyptic in scale. Terrors of technology and magic. Nothing that he, or anyone, can defeat.

They’ve watched us for centuries through the Rift. They’ve prepared. Invasion is inevitable. The Earth Fleet has known of the Watchers for years, unwilling to share the knowledge with humanity. Now it might be too late. Hidden away from the Fleet, one man is creating a new colony ship destined for the other side of the Rift, but he’s missing a few pieces. Three other people have varied paths to get there. Ace goes from the streets of Earth to the Fleet training facility on the moon. Flint, an ex-Fleet pilot, must decide if a job is worth his life.

Birdie Binkowitz is just a little bitter. As a young actress, she was the toast of Hollywood, definitely destined for greatness. Then the dragons had to rise up from their thousand-year slumber, take over Earth and ruin everything. Twenty years later, Birdie is living her worst life in her hometown of Tuscaloosa, Alabama, working at her father's Seed and Feed (and Bagels). Then, a mysterious dragon appears in front of the store seeking her help. He’s got a bone to pick with his fellow dragons–and he wants to hit them where it hurts.

Fans of the Divergent series by number-one New York Times best-selling author Veronica Roth will be thrilled by Four: A Divergent Collection, a companion volume that includes four pre-Divergent stories told from Tobias' point of view. Listeners first encountered Tobias as "Four" in Divergent. His voice is an integral part of Allegiant. Listeners will find more of this charismatic character's backstory told from his own perspective in Four: A Divergent Collection.