After being captured by Thanos for an entire month, Bucky Barnes is finally found in the worst possible way imaginable: falling from over 200,000 feet above Earth.

Drugged, tortured, injured, oxygen deprived, and chained to a massive weight designed to make him fall even faster, Bucky is trapped in a living nightmare specifically engineered around his greatest trauma: falling.

Years ago, Bucky fell from a HYDRA train into a frozen ravine, losing his arm and eventually becoming the Winter Soldier. Ever since then, he has secretly suffered from severe acrophobia and trauma connected to heights and falling.

Thanos weaponized that fear.

The Avengers are thrown into a desperate global rescue attempt involving failing technology, dangerous magic, atmospheric physics, emotional breakdowns, and impossible choices.

Tony Stark is leading rescue efforts despite his personal issues with Bucky because he refuses to watch Steve Rogers lose him.

Steve Rogers is barely holding himself together.

Natasha Romanoff is trying to keep Steve functional while helping save Bucky.

Thor wants revenge.

Bruce is running survival calculations no human should survive.

Strange is risking reality itself.

And Bucky is still falling.