Rainbow Six Siege (Vigil X Female Reader)

Callsign "Ghost" was conceived in a laboratory as an experiment of an illegal genetics program. The scientists that created her made her the perfect assassin and a genius, she has been perfecting those skills of hers since she learned how to walk and talk. The organization that made her began selling her to the higher bidder. The perfect killing machine to the one who can pay...no matter which side you are on.

(The book cover belongs to "plastic-bridge" on Tumblr)
(I do not own the pictures used in this book. All the credit goes to the respective artist.)