Harrie and her Alpha

"You need an Alpha," Dumbledore said.

Harrie stared. And stared. The old wizard looked back at her, with his usual kind smile, although it looked a bit wobbly, as if he was trying to put on a confident face while the situation was rapidly spiraling out of his control.

"I need a what?" Harrie finally said.

"An Alpha."

It didn't make any more sense than the first time he'd said it.

"Why do I need a letter of the Greek alphabet?"