East Passage

From the introduction:

When the characters wake up, they are in hammocks. The whole room seems to be swaying, the hammocks are shaking. They are not feeling particularly well, their stomachs are rebelling and they all have heavy heads (except No. 10, who was shanghaied on the high seas in the early hours of the morning). None of them has met the others, but from the way they look, they must have had similar experiences. And indeed: they were all invited to a "few cups of mead" the night before by unknown but very "friendly" people. Afterwards, their memories faded until they woke up. By all appearances, they have been shanghaied.