Ensign Maya Davis has had her sights set on the captaincy of a starship since she launched her first toy rocket into Earth orbit at age four. But not long after she departs the solar system aboard humankind's first interstellar vessel, New Horizons, sabotage cripples the ship, killing a third of the crew and stranding the expedition light years from home under the siege of hostile forces. Without knowing who she can trust, Maya must risk her life to get the crew home and prevent the genocide of the very exospecies Horizons set out to contact.