The Ghost Pirates

From itch.io: Bring your players on a journey with the Mortzestus - a doomed ship plagued by ill luck. But it is truly just misfortune, or is the ship being hunted? Find out in this adventure of nautical horror inspired by the novel by William Hope Hodgson. This is not a combat heavy adventure - it is focused on roleplay, investigation and - eventually - survival. They cannot save the ship, but a diligent party may be able to find the cause and prevent it from happening again. The adventure is also system agnostic - giving guideline for how difficult certain tasks should be rather than specific numbers, to allow you to use it for whatever system you like.