Short Stories from Hogwarts of Heroism, Hardship and Dangerous Hobbies (Pottermore Presents, #1)

by J.K. Rowling

Minerva McGonagall was one of only a handful of people who knew, or suspected, how dreadful a moment it was for Albus Dumbledore when, in 1945, he made the decision to confront and defeat the Dark wizard Gellert Grindelwald.