Spoiler alert: This post is part of an in-depth discussion of The Hand of Oberon by Roger Zelazny, which will inevitably reveal key plot points. I recommend you support your local bookseller or public library, and read the book first.
Corwin, Random, Ganelon, and Benedict compared notes after Corwin's party returned from the primal Amber, where the Pattern was found damaged by blood assumed to be from Random's illegitimate son Martin. Benedict revealed that he had been in frequent contact with Martin. The last time had been a note left with his friends, the Tecys, whom Martin had visited while suffering a serious stab wound. While Benedict and Random went into Shadow to call on the Tecys, Ganelon and Corwin returned to the palace.
There, Corwin calls on Vialle, Random's wife, to tell her Random is travelling for a day or two. After sleeping, he visits his old cell in the dungeon, where he cleans up the two sketches left there by Dworkin: one of the Lighthouse of Cabra that he used to escape, and the other of Dworkin's quarters on the other side of its wall. He teleports through the latter. Dworkin, mistaking Corwin for Oberon, asks if it is finally time to destroy the world.