Tortured. Beaten. Abused. Trained. Onyxx or Knox is Bucky barnes' daughter she just doesn't know yet. Being raised in HYDRA she is sent on missions daily but one mission is different. She was sent to kill The winter soldier for leaving and betraying HYDRA. That one mission will change the whole life she thinks she's living. ⚠️I suck at descriptions but trust me the book is pretty good ⚠️ ⚠️TW⚠️ Abuse An avengers fanfic