The Life, Death, and Resurrection of James Buchanan Barnes

One day in 2012, Steve Rogers encounters a doppelganger of himself who says three words that change everything. This story begins with two friends growing up in simpler times. It then goes horrifyingly dark (and I do mean DARK). It might shatter your heart into jagged pieces, but if it does, I hope it will then put those pieces slowly and painfully back together again.