U.S. waters draw a creature, tracked by Rich and Laura via a GPS device to a California waterway, where a monster surfaces---to the astonishment of locals and tourists. Meanwhile, Nimrod gets loose in a large grocery store; and Laura faces Cirko's scrutiny.

A cover-up imperils Laura, hiding out with Rich in a California cove, where she makes disturbing finds on the creatures from Cirko's files. Elsewhere, a frantic Miles flees with Nim in a getaway that embattles him with cops and forces him to make an emotional decision.