In the twenty-fourth century, a sophisticated security system called the perimeter guards the outer rim of the solar system. Governed by Titan, a powerful space station, the perimeter is almost impenetrable. Emmeline Augury, an astrophysics cadet on Titan, believes in a family folklore about a mythical device with unlimited power. Her search uncovers an ancient plaque, which reveals a star map of a secret network of portals. But what begins as a scientific adventure turns into a dangerous manhunt when hostile aliens called Orias attacks Titan. Their queen threatens to slaughter everyone unless she is given the device. When the fate of Titan and the seven realms hangs in the balance, Emmeline must make a choice. Will she save her home or the device?