You Must Remember This

Dedicated to my friend and fellow Sebastian Stan fan, Deborah

Bucky Barnes is targeted by a relentless assassin and must face his turbulent past - as well as the woman he has only known hatred for - in the hope of facing his greatest nemesis.

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Following the fallout that caused the Avengers to disband, Steve Rogers entrusts his friend Bucky Barnes to the Crown Prince of Wakanda. But soon after, an assassin is captured in Wakanda. Her codename: Nemesis. Her mission: to eliminate the Winter Soldier.
As Steve and Bucky seek answers, they uncover a surprising link to Evelyn Rogers, Steve's twin sister. They learn that she perished in a fire in the 1960s, with the only thing retrieved from the ashes being a strongbox containing several letters and a carefully wrapped package addressed to James Buchanan Barnes.
Among Evelyn's belongings is her diary, an unexpected bequest given her and Bucky's mutual animosity. And how could she possibly have known he was still alive? Encouraged by Steve, Bucky reads Evelyn's final words, and page by page, his memories return. But as he nears the end of the diary, it becomes clear that some memories should have remained lost.

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[[This story is finished; average word count per chapter - 3.300]]
IMPORTANT; please read the author's note for all trigger warnings. I do not go easy on my characters. Advised for mature audiences only.