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After a field agent disappears while keeping surveillance on the home of the mother of missing Big Horn ship crewman Sonntag, Molly and Cavennaugh head to New Harmony, Indiana to investigate the crewmember's hometown.
There they encounter the local preacher, Reverend Lavory, who is captivating his parishioners with his visions of a "sea of glass" and the impending apocalypse. After they witness other bizarre happenings in the town, Molly and Cavennaugh keep a suspicious eye on Reverend Lavory while also looking out for any signs of crewman Sonntag's reemergence.
Meanwhile, when it's suspected that crystals formed on washed-up wreckage of the Big Horn are capable of spreading infection, Fenway, Pegg and Ramsey search the ocean floor to find the remaining pieces of the ship to before there is any possible contamination to the surrounding environment.