On one of the hottest days of the year, the first responders feel the pressure as harrowing incidents keep happening: a road rage accident involving a van full of tourists, an emergency at an auto-repair shop and a veteran with a grenade embedded in his leg. Meanwhile, Buck gets a surprise visit from his sister. Athena questions her relationship with Bobby. Also, new hire Eddie jeopardizes Buck’s chances of being chosen for a fireman calendar.
