Yin finds herself a hostage to Joker, who refuses to give up her location when captured, claiming she will go out with a big “pop” unless he is released. Seeking to find out where she is, Dr. Hugo Strange opts to use a device created by Wayne Enterprises to find the answers, but Batman believes he stands a better chance, and uses the prototype of the device to enter Joker’s mind. But he soon finds it a dangerous place to be in, and that he could go mad if he is not careful.
