David Diesel Lagerford rides his T-box across timelines, where each stop is a parallel world with its own Diesel, wife Lilah, and daughter Rose. Its origin uncertain, the T-box is safe for any of the Diesels to use, and they do so to gather and bond in a tight brotherhood. But instant death awaits all other would-be travelers, a limitation unacceptable to the Lilahs and Roses. Determined to travel the timelines themselves, the sisters work to reverse engineer the T-box. But in their rush to succeed, they inadvertently expose the technology to an outsider-Sparky Fontaine-who exploits the information to build his own device. Intent on gaining immense wealth and power, Sparky uses his T-box to kidnap Diesel, and then makes alarming demands for his safe return. Cornered, the Lagerfords devise a high-stakes rescue gambit. But how do they locate a hostage adrift in time? And can they execute their plan without revealing their secret to the world?