The science-fiction thriller, also featuring Sigourney Weaver, is rather ordinary but is lifted by its performances

In “The Gorge,” Teller and Taylor-Joy play elite snipers who are recruited to live in guard towers on either side of a fog-shrouded gorge for one year. Their recruiter, Sigourney Weaver, won’t tell them what they’re guarding — only that they can’t let it escape the gorge — and their rotation begins sleepily enough.