Marvin's voice remained calm, as if he were discussing a trivial matter, "Back then, I was only 22 years old, full of youthful arrogance, and had a short temper. I simply looked down on the Doomsday Party, not treating them as a threat at all. How could an organization formed by a bunch of lunatics be stronger than the Kingdom of Windsor?"
"After we finished moving the cargo aboard, we let them go, and nothing happened afterward."
At that point, Holmes said, "It must have been because you let them go. If you had continued to torment them after hearing the name 'Doomsday Party', they would certainly have sought revenge. However, since you released them, the Doomsday Party is not supposed to trouble you according to the rules."
"Perhaps so."
Marvin chuckled, murder at sea is too difficult to be discovered. Even if those men were part of the Doomsday Party, what of it?
Kill them all, tie stones to their bodies, and throw them into the sea, scuttle the ship, who could discover it?