In Trap, by M.Night Shyamalan, a psychopathic killer/family man does everything he can to escape the trap orchestrated for him by multiple police. With a certain guilelessness (except for Josh Hartnett) the cast is largely appealing. Hartnett succeeds as the killer; Alison Pill is unerring as his wife. But the film doesn’t come off. Shyamalan is no writer. There is in Trap, as Ross Douthat indicates, a “ludicrous but memorable setup.” It is ludicrous, though.