Three hours and no ghosts later, Sam and River discovered the source of the attacks: insurance fraud.

Too bad the insurance defrauders discovered them, too. And now they were trapped belowdecks on a ship about to go commit arson -- and be burned up in the process.

"Knife," Sam whispered to River, as tied up as he was. "Right boot." If she could get it, they could get out of their bindings. Then... then they'd figure it out from there.