Two full days and nights, and he's not been back. Usually when one cat disappears like this the others don't even blink. They know the living cat, and apparently once a cat dies, it's out of their memory banks. This time Toby is looking lost, and subdued; then I realized that he and Sammy were, if not littermates, at least bonded males, which is the next thing to it, and he is wondering, perhaps, what's missing in his life right now. Damn.