Fatal code
(Book)

Sequel to: Lights out.

"In the global race for space domination, a cryptologist must overcome his greatest mistake to help the granddaughter of a nuclear physicist decipher the clues to a top secret nuclear project before it falls into the hands of America's enemies"--,Provided by publisher.

Elinor Mitchell, the granddaughter of one of the scientists from the Los Alamos Five project, discovers that she has highly sensitive information on the project in her possession-- and a target on her back. SNAP agent and former Navy cryptologist Kekoa Young is tasked with monitoring Elinor. This is both convenient since she's his neighbor in Washington, DC, and inconvenient because he likes her. As Elinor follows her grandfather's clues to a top-secret nuclear project, Kekoa has no choice but to step in. When Elinor learns he has been spying on her, she's crushed. But with danger closing in on all sides, she'll have to trust him to ensure her discoveries stay out of enemy hands.- adapted from back cover.