Here's how a Reddit-user describes the book
"This story is told from the perspectives of Steve Rogers, Bucky Barnes, and Brock Rumlow, mostly during the final fight in Captain America: The Winter Soldier. In present day, Captain America, Falcon, and the rest of the team travel to Lagos, Nigeria in search of Crossbones."You can check out the digital comic below, courtesy of Comixology.
Marvel's Captain America: Civil War Prelude Infinite Comic #1 - Comics by comiXology