Harleen Quinzel has a sister that few know about. Amelia is very different from her little sister Harleen. While Harleen wanted to help people and so did Amelia but not in he same way as her sister, Harleen wanted to help the mentally ill so she became a psychiatrist Amelia wanted to help the people of her country and make sure her sister could have her dream. Harleen hadn't seen her sister in about a year and a half since she's been deployed over seas she's just started at Arkham when her sister is coming home twist her sisters lost her left arm and its now replaced with a removable robotic one. Since Amelia can no longer serve in the military she's offered to work as a guard in Arkham. What happens when she finds out little sis is in love with the joker well it's a bumpy ride and she's drug along with them.