Bobby and the 118 race to the rescue when an abandoned oil well erupts and causes a massive sinkhole in downtown LA. Athena investigates a 30-year-old cold case involving a casino robbery. Buck fears his relationship with Taylor might be ending, and Hen meets a man from her mother, Toni's, past.

The members of the 118 race into action when a women falls over her penthouse balcony. Meanwhile, Athena investigates when a bike rider is impaled on a stop sign, Eddie begins his therapy for his PTSD and survivor's guilt and Maddie fears the worst when Jee-Yun falls ill.

The 118 race to the rescue at emergencies when a fire breaks out in an accountant's office and a car crashes into a "living funeral." Athena is shocked when a suspect dies in her custody minutes after she arrests him; Buck is attracted to a death doula; Maddie and Chimney panic when they are audited by the IRS.

Maddie and Athena investigate a case surrounding an abducted mother and child as Hen and Karen learn more about Mara’s family history. Meanwhile, Eddie grapples with unresolved feelings for someone from his past.