Danny and Stella are investigating a murder of a billionaire in a crime scene what seems to be a bedroom but while Stella is interrogating suspects, Danny searches the room for possible evidences and Danny manage to push a button that turns the bedroom into a panic room. With Danny trapped inside the room, they have to find a way out for Danny while a murderer is at large.

On a trip home from work on the subway, Danny sees a body laying on the tracks. Luckily, he manages to stop the train before destroying any evidence. Mac Taylor, arriving from a Mayor's reception in his tuxedo, and Lindsay Monroe join him. Stella and Hawks investigate the death of stock broker found hanging from a noose off of the window of his fancy office. As usual, the hanging was staged as the man was strangled to death.