The Falcon, The Winter Soldier And The Devil.

Just the Falcon and the Winter Soldier but with one more character (Y/n).
(Y/n) is just like Bucky and Steve. Fought the World War 2 with them. Fell on a mission from a plane believing she is dead but Hydra took her and experimented a new serum on her. Not the super soldier one but the Hell serum. Basically the serum gave her wings and turned her into an immortal which gave her the code name "The Devil".
(Y/n) has lost many people in her life and with recently losing her big brother,Steve, was hard for her.
She said she doesn't need help but Sam and Bucky know she does.
Bucky as her other big brother and Sam as her ex(not for too long)try and help with no success.
All three of the heroes take their own way and lose contact.
What happens when Sam gives away Steve's shield and a new Captain America is created?
How will the trio react on it and how will they work out having to reunite to fight a new evil in the world?
Find out now.