Malaysia Airlines Flight 370 leaves Kuala Lumpur for Beijing on 8 March 2014 with 239 people aboard and never arrives, its transponder cut and its last radar contact somewhere over the Andaman Sea. The film works through what investigators actually had to go on: satellite handshake data, drifting debris that washed up as far away as Réunion Island, and years of surface and seabed searches that covered huge stretches of the southern Indian Ocean without finding the wreck. Interviews with air-crash investigators, engineers, and relatives of passengers lay out the competing explanations, from mechanical failure to deliberate diversion, and computer simulations model flight paths consistent with the satellite pings to show why searchers kept looking where they did. The film is candid about how much remains unresolved, including the argument that the plane may rest in a stretch of ocean floor never actually searched. No wreckage recovery, no confession, no black box; just the data trail and the case it can and cannot support.