Butters jumped down a shaft between the bookcases, where they meet in the corner. The shaft is 1’x1’x8.5′ tall, and there was no way for her to escape on her own. I spent an hour and a half lowering down duffel bags attached to ropes, filled with cat food; screen door material cut to size; rope ladders; etc. Pathetic mewling sounds issued from the shaft. Finally, a red cat play tent (yes, I have a red cat play tent) was the thing that worked. I attached it to a rope and shot it down there. She climbed on top and I airlifted her out. We spent part of last weekend cat-proofing the living room.