At Station House No. 4, Inspector Thomas Brackenreid and Detective William Murdoch are approached by a trusted ally of the station (perhaps a returning character like Effie Newsome or Louise Cherry). They introduce their "cousin," Constable Jamie Vance, a brilliant transfer from a rural jurisdiction. The catch? "Jamie" was rendered completely mute by a childhood bout of scarlet fever. In reality, Jamie is Jane Vance, an aspiring detective disguised in an oversized constable's uniform and cap.