The Snatchers

"Rule number one: never assume you are safe."

During the hunt for horcruxes, a group of snatchers discovers the Golden Trio. In the squabble, the three friends are separated, and while Harry and Ron apparate away to safety, Hermione is taken to face the consequences at Malfoy Manor.

This is a dark AU where Hermione finds herself in a tough situation--swear fealty to the Dark Lord, or die. As much as she'd like to claim otherwise, Hermione is nothing if not self-preserving. When she makes the choice, it is an easy one.