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.

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.

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.

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.

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.

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.

A girl named Rose is riding her new bike near her home in Deadwood, South Dakota, when she falls through the earth. She wakes up at the bottom of a square hole, its walls glowing with intricate carvings. But the firemen who come to save her peer down upon something even stranger: a little girl in the palm of a giant metal hand.

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.

Nancy Kranich (played by Emmy-nominated actress Natasha Lyonne of Russian Doll and Orange Is the New Black) is a night nurse on an orbiting space station. But Nancy hates her job, is sick of space, and longs to find adventure and a safe place to smoke cigarettes that won’t blow everyone up. But when Nancy gets caught up in an outer-space conspiracy involving President Kennedy, former vice-president Richard Nixon, and an intergalactic object that could change the course of history, she gets way more adventure than she bargained for.

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.

Get ready to experience two more origin stories in the Backyard Starship universe.

In hiding all her life, Layala prepares for the day the wicked High Elf King Thane will come to steal her—his powerful mate. She trains to take her revenge for the wrongful execution of her parents, who died for her freedom. Now that day has come, forcing her to come face-to-face with what she’s hidden from: a dangerous, dark-haired, warrior king determined to marry her.

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.

All Blythe Sol ever wanted was to be a normal girl. Yet, her dreams of following in her father's footsteps by joining the military after graduation are crushed when nuclear war comes to the United States in the year 4006. Tens of thousands are killed in a series of attacks on many major cities, while thousands more are left injured from the devastation of the blasts, or terminally ill from the effects of radiation.