Regulus of Hogwarts: Lord of the Stars

Paris. Tenth arrondissement. An unremarkable street, an unremarkable building.

The stone facade had been smoked grey by decades of weather. Narrow windows. Rust creeping along the ironwork railings.

Through the wooden door, a cramped hallway stretched toward a staircase at the far end.

Dumbledore climbed. The stairs groaned under him, turning twice before he stopped at a dark wooden door.

Three knocks. A pause. Two more.

The door opened from inside.

The man who answered was short, his hair snow-white. He wore deep blue robes beneath a dark waistcoat embroidered with gold symbols.

Pale grey eyes, warm when they settled on a visitor.

Nicolas Flamel.