In Michael Goi ’s watery ghost story , “Mary,” the British actors Emily Mortimer and Gary Oldman are dumped on a haunted sailboat, saddled with American accents and subjected to a series of recycled, yawn-inducing scares.

Not helping matters is a tension-sucking script (by Anthony Jaswinski ) that reveals almost immediately who among the tiny cast will survive to see the end credits. Flashbacks fill in the blanks as a bedraggled Sarah (Mortimer) is found floating on what remains of the vessel and is interrogated by a suspicious police detective ( Jennifer Esposito ) on what happened to her family and crew. It’s a tale of supernatural shenanigans undergirded by a shaky marriage, beginning when Sarah’s husband (Oldman), tired of being a captain-for-hire, impulsively buys the mysteriously abandoned boat to start his own charter business. Though maybe a trip through the Bermuda Triangle wasn’t the best idea for a maiden voyage.