Between Light and Dark

With the threat of the impending rise of You-Know-Who, Order member Robin Mulciber volunteers to take on the most dangerous inside mission... marry Barty Crouch Jr and try to take down the Death Eaters from the inside... The catch? Crouch is her ex from school... And his feelings may have grown more twisted and psychotic than she remembers. (Barty Jr. x OC) and (some Sirius x OC)