Fraternal twins Nikki and Nora are forced back into each other's lives when they inherit a detective agency. As they solve a murder, they realize their differences may be their greatest advantage.

During the darkest days of the Cold War, a consortium of corporations and government agencies conducted secret research into time travel. Decades later, a couple of backyard mechanics uncover a smuggled cache of documents from those officially-forgotten experiments. Hacking together their own device tests their know-how, their dreams of sudden wealth, and their friendship. Can they survive the limits of dwelling in the past?