Who's playing with your mind

In short: Steve and the Avengers find themselves in a battle with a witch. Steve takes a hit for Tony, and then he's kidnapped. The Avengers are desperately trying to find him, but when they do, it seems it's too late - the witch has managed to break Steve, and now he's under her control. The team has to fight its leader to bring him in and heal him. In the process, a lot of secrets come to light.

It was Hydra. Of course it's Hydra. Who else is going to attack Stark Tower at 4:00 in the morning? Steve was, to some extent, glad there was an emergency, because he couldn't sleep, tormented by yet another nightmare. At least he'd clear his head.

Steve put his Captain America uniform on in no time and flew out of his room to the sound of the alarm. He had to get to the other teams. They had to hold together and come up with an action plan. The soldier threw his shield forward, knocking down the hydra agents coming across him and abruptly swerving to his left, just in time to avoid a knife. "Damn it, Howard, you said Hydra wasn't going to attack me with a pocket knife," Steve thought, smiling, then quickly grabbed the hand before retreating for another attack, twisting it until the knife fell. Then captain America stuck a nice patriotic fist in the attacker's face. He came down lifeless on the floor.

"Romanoff! Barton! Stark! Can you hear me? Where are you?" shouted Steve in the communes, who he hoped the other avengers would have included. A soft snap was heard and the soldier with relief heard Natasha's breathless voice.

"I'm on the training floor. There are about a dozen Hydra agents with me."

"Do you need any help?" asked Steve.