As the primary streaming home for CBS, Paramount+ carries every episode of Ghosts in 1080p (and 4K for certain tiers). You can watch the S04E01 premiere immediately with a subscription.
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In this premiere, Sam and the other spirits realize Isaac is missing and initially suspect he is hiding following his cancelled wedding with Nigel. They eventually discover he has been dragged into a dark, underground lair by Patience, a 17th-century Puritan who was banished from her own community for being "too severe". Key Plot Points Patience’s Revenge: As the primary streaming home for CBS, Paramount+