eversion by alastair reynolds ...
Probably one of the best book I read in many years! I warmly recommend it.
Eversion is a superb, original Gothic SF novel. A small group of intrepid explorers are in search of a remote and mysterious artefact. It's a well-funded expedition, well organised, which is lucky as they're sailing north of Bergen on the schooner Demeter, searching for a narrow inlet which will lead them to a vast uncharted lake - and their goal--
Until disaster strikes.
It starts as a kind of XVIIIth century maritime voyage tale and then you discover progressively some Gothic/horror sci-fi stuff meshed with that. Reynolds writes very, very well. Plus he is in "hard sci-fi". What's not to like? :-)