Enemies, Friends, Lovers

The night before her fifth year, Lily receives a mysterious letter warning her not to return. Is it a pure-blood prank or something more serious? Who's behind the dangerous events unfolding at Hogwarts? And why are Lily and the Sorting Hat involved? Lily's story between years 5 to 7 of how she began to see James Potter as anything more than an arrogant toerag. (Jily & Wolfstar).