Don’t you want to know what they are? “The Watchers” stars Dakota Fanning (“Once Upon a Time in Hollywood,” “Ocean’s Eight”), Georgina Campbell (“Barbarian,” “Suspicion”), Oliver Finnegan (“Creeped Out,” “Outlander”), and Olwen Fouéré (“The Northman,” “The Tourist”). The film is produced by M. Night Shyamalan, Ashwin Rajan and Nimitt Mankad. The executive producers are Jo Homewood...