Chicago Fire: Virgin Skin

With Katie's whereabouts still unknown, Kelly interrogates Vince - the man who threatened him during the blackout - but he's stopped in his tracks by Detective Lindsay, who tells him to let the professionals do their job. As hours turn into days and with still no sign of his sister, the firefighter decides to take matters into his own hands. Casey knows passing her medical check-up is essential if she's to continue with her training, so she lies about the doctor's diagnosis