Imperium by Aphoride

Men become accustomed to poison by degrees - Victor Hugo

It is October 1949: Lycus Malfoy is dying, quarantined in his house alone but for his wife, Adelaide, who still hopes there is a miracle cure; Eileen Prince has vanished into a Muggle life, washing the dead and arranging flowers, away from the sneers she endured at school; Cygnus and Orion Black are at war with each other even as they bury their secrets six feet deep. 

There is a murderer on the loose, shrouded in paranoia, and the old structures, things of blood and age and time, are starting to crumble. 

And a ship arrives from Lübeck bringing Tom Riddle home.