It’s been twenty years since the Sion arrived on Earth, changing everything, and Sasha Morency has spent her life avoiding their notice as best she can. She’s grown up with a collapsed population, unstable climate, and the bare minimum of survival necessities, all while the conquerors thrive. When she’s caught up in an investigation of the theft of rare jewels at the Reliquary where she works, she becomes the focus of a cynical Sion who is charged with solving the crime.

Banished from his Sion clan and his squad in the police department for not following orders, Dram Opano is not surprised to be assigned a basic theft case at an obscure Earther museum. A young woman working there knows more than she’s telling, so Dram decides to stay close. Sasha has a talent for climbing walls, confronting authority, and digging for information, much to his surprise and delight.

Sasha and Dram expect to distrust each other, but as they pool their resources to discover exactly what happened, a bond of respect and passion develops between them. When Dram is kidnapped by the people behind the theft, Sasha has to call on all her skills to save him. It’s a question of survival, for both their lives and their love.