Batman: Arkham City - Harley Quinn's Revenge

Harley Quinn's Revenge opens with Robin searching for Batman, who has vanished while infiltrating Harley's headquarters in the Industrial District to free several police officers she's kidnapped. During the search, Oracle confides that she's worried about Bruce, who hasn't been himself since the Arkham City incident and refuses to speak about Talia or the Joker. Robin eventually finds Batman's Utility Belt, discarded. The story then rewinds two days. Batman learns from Gordon that Harley has taken several officers hostage, and Gordon warns him before he leaves that Harley still blames him for the Joker's death — and that it could be a trap. Batman rescues one officer from the Steel Mill, who reveals the others were dragged elsewhere. After obtaining the location and access codes to Harley's secret base, Batman infiltrates the shipping yard and tries to save another captive, but is knocked unconscious after intercepting a shot Harley fires at the officer. When one of her thugs strips off Batman's belt, its built-in countermeasures electrocute him, and he drops it — leaving it for Robin to find.