Carol and her husband, Bob, are introduced as Homeland Security agents who take over the case of Agent Thomas' murder from Catherine Chandler and Tess Vargas. However, they later catch Catherine & Vincent Keller investigating the case without permission. Vincent tells them that someone tried to kill Catherine, as well. Carol figures out that Vincent & Catherine are engaged, and empathizes with them. Carol decides to team up with them, and convinces Bob to. Vincent & Catherine tell them that Thomas was killed by a sniper. They figure out the building the shooter was in, and Carol & Catherine go undercover to see if they can find evidence of the killer. Though security finds them, the two are able to escape with the evidence.