Deep Rai

Leanne and Jesse instruct a young girl on how to use a small plane's supplies to construct a makeshift defibrillator when her mum, the pilot, loses consciousness.

Conrad works to diagnose a young woman after she is admitted due to extreme night terrors; Devon tries to survive his first Halloween in the emergency room.

On Halloween, the squad members pull out all the stops as they compete for the title of 'Ultimate Detective Slash Genius.'

The Payne servers get hacked, causing Katherine and Elliot to clash on whether or not to pay the ransom. It becomes increasingly personal for Katherine when the hackers reveal they have photos of her.