A Florida park ranger probes strange happenings in his community when the town sheriff quarantines the entire area after a hurricane.

The discovery of an Air Force officer, barely alive and with wounds identical to Dave's, intrigues Russell; Mariel finds something unexplainable protruding from the downed officer's wounds.

Russell must save Jesse after he is knocked out by a mysterious force while checking out a submerged mobile home. Larkin suspects that Underlay knows about a military cover-up.

Sheriff Underlay just might get the quarantine he wants when Russell discovers that the escaped lab animals may be responsible for a deadly flu virus spreading through Homestead.

Larkin becomes suspicious of an old boyfriend's motives when he invites her to visit his military base. Mariel worries that she hasn't been a good mother since the hurricane.

Russell meets a Cuban refugee who has lost his family to "the lights," and decides to try to catch one of the mysterious, luminescent beings.