A book bound in human skin leaves a trail of suicides in its wake. The King in Yellow seeks an heir. Words of torment protect our universe from madness. The notes of an old man contain a blasphemous tale. The book Llyfr y Cythraul reveals a fate to a woman from which she cannot escape. Blasphemous and forbidden books, which carry terrible secrets or summon horrific entities, have always been an essential part of the Lovecraftian cosmos. Sixteen authors once again tread in the footsteps of the master and have set out to open the library of terror, encountering mysteries beyond human comprehension. The horror does not lurk in graves or haunted houses, but between the words and letters of wicked books.