The Set up

Matilda Grace was only 13 when her father died. Going to live with her fathers closest friend, she quickly realizes that she just moved in to Stark Tower and is living with the Avengers. Over time she becomes best friends with Captain America himself, and when he turns to her for help with a problem she says yes. How was she to know that she would be helping an ex assassin and dare she say, even possibly falling in love with him.