Ashley and Jack have traveled back in time again. They went from 2016 to 1940, just before America's involvement in World War II. They were on a public relations flight dreamed up by the Pentagon to celebrate Ashley's promotion to rear admiral, making her the youngest admiral in history. They've time travelled before, but this time it's different - they encountered a time portal, or wormhole - in the sky. They have a duty - to warn the authorities of the coming war. They also have a duty to themselves. They want to return to their home, their home in 2016. Their plane had a cockpit data recorder, a Black Box, which would give them the coordinates to find the wormhole and return home. But they're horrified when they realize that 1940 technology could not read the data on the Black Box. They're stranded - 76 years in the past. Will they have to restart their lives from 1940 and never return home? Or will they find a way to read the secrets of the box?