An attack by cyber criminals sends the Chastain ER into a tailspin and Kit tries to figure out whether or not to pay the ransom. The Raptor deals with a personal connection to the patients brought into the ER during the attack, leaving them all vulnerable. Meanwhile, Conrad works on balancing life as a new dad and Devon and Leela debate taking the next step in their relationship.

When one of the doctors is found unconscious in an elevator at Chastain, the staff frantically retraces his steps to figure out the cause. Billie is faced with a personal conflict when she comes face-to-face with the secret she has been hiding all these years. Meanwhile, Bell helps Kit make a decision about a new neurosurgeon joining the team at Chastain.

Kit hires a surgical coach to watch over Bell and Raptor and help them brush up on their skills. Upon receiving attention from multiple women at the hospital, Conrad contemplates jumping back into the dating scene. Meanwhile, Devon works with an elderly couple.

When the first day of Kit's experimental Flight Go team program sends Conrad out into the field, he builds a new relationship with a fellow doctor along for the ride. Devon works with Trevor for the first time on a patient with a mysterious fever, the cause of which can't be found. Meanwhile, Bell is hiding a secret from the whole staff and they are starting to become suspicious.

When a lost child is brought into the ER with physical signs of abuse, Conrad and Cade try to get to the bottom of what happened to her. While out shopping, Devon and Leela encounter a woman who is having trouble breathing, and when she arrives at the hospital, Devon takes it upon himself to make sure she feels comfortable with the staff. Meanwhile, Bell eyes an open seat on the State Medical Board and Billie decides it's time to confront her past

Conrad contemplates his future; Devon is presented with an amazing career opportunity out of state; Ian is faced with a devastating diagnosis; Kit and Bell celebrate their engagement; Padma receives some highly anticipated news.

When a gunshot victim comes into the ER, his injuries prove to be so catastrophic throughout his body that multiple doctors need to jump on the case. Meanwhile, Ian is faced with a mandatory drug test and Padma prepares for her C-section.

Ian is faced with performing a surgery on a Jane Doe NICU patient while he continues to struggle with his personal issues. Meanwhile, Conrad asks Devon to cover his shift so he can spend a day at home with an anxious Gigi.

On the day of Kit and Bell’s wedding, Bell and Conrad get pulled away to tend to the ill daughter of a major hospital donor. Meanwhile, Billie takes Gigi and Sammie dress shopping.