By GUY LODGE
Michael Thelin’s cool, collected home-invasion chiller suggests he’s seen ‘Funny Games’ a few times, which is no bad thing.
“Don’t Tell Mom the Babysitter’s Deadly” could work as both an alternate title and shorthand synopsis for “Emelie,” a familiarly premised but stringently executed home-invasion chiller that rarely goes for the straight-up scare when a more insidious one will do. Likeliest to prey on the sensibilities of younger parents — and to unnerve anyone who still thinks of gifted Irish actress Sarah Bolger as that preciously innocent pre-teen from “In America” — music-vid helmer Michael Thelin’s lean, lo-fi debut feature calmly pushes against the nastier bounds of its genre territory as it places two young children in the care of Bolger’s profoundly unhinged imposter. This ambiguous protagonist’s backstory emerges a little more predictably than it should, but even with that knowledge in place, Thelin succeeds in keeping any presumption of eventual sanctuary impressively at bay.