Locket

It's 1945 when sibling duo yn and Bucky go on a mission alongside there best friend Steve A.K.A freaking Captain America. However things don't go quite as smoothly as planned. While fighting hydra on the train Bucky slips and falls. Yn and Steve think they have escaped when yn mysteriously goes missing. Will the sibling duo and Steve be reunited once again or will things yet again not go according to plan?