The real story of the 'Mary Celeste' was in a documentary repeated on Sky only the other day.
Apparently her sole cargo was barrels of industrial alcohol, which somehow ignited, when the hatches were opened there was a great "Woosh" of flames so the Captain his wife and babies, and the small crew abandonded ship.
They took to the ships tender which was attached to the main vessel by a thick line, which after towing them some distance, broke. The Mary Celste drifted on and once the spirit burned out the flames died without igniting the vessel, but the doomed ships company was unable to reach her, as she was still under sail.
At the time this was all pretty well accepted (and documented) by the US Marine Authorities. It was many years after that the renowned writer Arthur Conan Doyle got wind of the story and re-worked it into a great mystery yarn, which he got published in the "Strand Gazette", I think.