Hermione Granger, Ghost Buster!

The MoM has a division within the DRCMC that deals specifically with ghosts and spirit related entities, this much is canon, but what is done there beyond stop annoying specters like Myrtle from Haunting Olive Hornbey? At the end of their first year, distraught by Harry's injuries on the stone adventure Hermione decides to go looking after an obscure book, as a way to save Harry.