Hermione seeks knowledge from a reluctant Snape in order to help the War effort. What she receives is more than either of them expected. Set beginning in Hermione's sixth year, continuing into a slightly AU post-DH era.
This was a goodin! Good slow build (not too much OOC), still pretty canon-compliant, didn't delve into any crazy dark Death Eater tropes, and the pendant communication was a sweet addition. Author did a good job at staying canon-compliant without seeming redundant. And even with the ending, I respected the author for not taking a typical HEA.