Blake LivelyAt a time when more and more promising directors are quickly swallowed up by the remorseless blockbuster machine, there’s something admirable about a filmmaker like Jaume Collet-Serra (Non-Stop, Run All Night), who is seemingly content to stay a rung or two down on the respectability ladder and continue refining his chops. The Shallows, Collet-Serra’s new primal screamer, may not be his best work—that honor still falls to the wonderfully sick Orphan—but its single-minded devotion to getting viewers to grip their armrests is really something to see. Clocking in at a lean and mean 86 minutes, it takes its deliberately simple premise and comes close to knocking the damn cover off of it.