Alexis Scheer’s new play, “Breaking the Story,” begins with a bang, literally, and features several more before its roughly 80 minutes have expired. The central character, Marina, is a veteran foreign correspondent who clearly suffers from PTSD. We meet her in an unnamed war zone as she tries to report between missile strikes; yet the explosions continue intermittently, as flashbacks, even after she has moved to more peaceful surroundings — a house with a garden at Wellesley, Massachusetts — to ponder early retirement.