At 8:15 in the morning, a small commuter plane carrying forty-seven passengers crashes into an apartment building in Granada Hills, California. Shock waves ripple through Los Angeles, as L.A.P.D. Lieutenant Peter Decker works overtime to calm rampant fears of a 9/11-type terror attack. But a grisly mystery lives inside the plane's charred and twisted wreckage: the unidentified bodies of four extra travelers. And there is no sign of an airline employee who was supposedly on the catastrophic flight.