Fatal Code by Natalie Walters

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.

https://rapidgator.net/file/3254eddb01f014ac354a26e5d0d9bdae/

https://nitroflare.com/view/CC332AE4F61E0D6/