Un-for-Seen

A dark tale on wizarding society. Time-turner use is common at Hogwarts, although no one talks about it. The bests usually get a chance to spread their wings with it. Talented but subdued halfblood girl gets sorted into Slytherin in 1990, her view on the events and her Head of House is shifting year to year, but can she rescue her favourite teacher? Would he let her? Very slow burn