“Isolation” (*1/2 out of four) was a substandard, suspenseless melodrama based on a true story about a couple (Luke Mabbly and Tricia Helfer) vacationing in the Bahamas who are taken in by seemingly friendly neighbors (Dominic Purcell and Marie Avgarepoulos) who offer them drinks and hospitality. It’s no surprise that the pair turn out to be murderers out to gradually steal their identities. Lacks any surprises or sparks, and takes too long to unravel and get where it’s going. Purcell is good though and perhaps should start taking on more bad-guy roles.