Sleeper

"She will talk like a pureblood, act like a pureblood, understand pureblood traditions better than a pureblood. By the time she reaches Hogwarts, no one will question her." After the death of James and Lily, Sirius and Hermione become a sleeper cell, determined to take down the Death Eaters from the inside. Eventual Theo/Hermione. AU. Pureblood!Hermione, Slytherin!Hermione,COMPLETE