In the events leading up to What Ails You, Bruce had to track down a secret lab run by a shadow organization and then figure out the best way to keep Harley and the rest of The Pact from getting that information. Unfortunately, this wasn't an easy task and Harley decides to finally track down who the rat in her organization is. The resulting conflict means either you turn on Catwoman and claim she is the traitor, or you take the blame yourself. If you chose the latter option, Episode 4 starts off with Bruce trying to break his way out of Mr. Freeze's cold chamber, while the option of turning Catwoman in means that she will face some dire consequences and Bruce's relationship with Selina will be considerably worse off.