Severide and new lieutenant Eric Whaley (Shane McRae) have someone in common—Whaley's sister Renée, who had cheated on Severide. Eric has blamed Severide for his sister's drinking and ending up in a three-month coma. After the coma, his sister has not come around the family. Shay sticks up for Severide, saying that he is not the cause of her current troubles. Severide later tries to call Renée, but her number has been disconnected. Meanwhile, Dawson, Otis and Herrmann become co-owners of the bar, and Dawson's love triangle with Mills and Casey gets interesting as both men become aware of the other. Also, several of the firehouse calls have a link to Antonio's laced-heroin case, which leads to his getting shot.