On the morning of her fourth birthday in 1812, a little girl encounters an alien being who silently conveys a secret code that she recalls a lifetime later only hours before her death in 1857. Frail and nearly unable to speak, she transmits the code to a trusted colleague who hides it, only to be discovered and decrypted in 1940 by Nazi scientists who believe its secrets can perpetuate the Third Reich.

A young nurse who is abducted from Amsterdam and conscripted to serve the medical needs of Hitler's generals in the Berghof, his vacation residence in Bavaria, foils the plot by stealing the secrets of the code that now envelopes her with extraordinary powers. Consumed with vengeance and obsessed with reclaiming the code, a vicious Nazi general relentlessly pursues the fleeing nurse who is now protected by a mysterious extraterrestrial device known as CARLi, which holds the promise of eternal youth and the secrets to scientific breakthroughs that can alleviate human suffering.

Interlaced with facts from historical events and inspired by phenomena officially designated as unexplained, CARLi is filled with suspense, romance, horror, and mystery.