Ship of destiny - Robin Hobb (The liveship traders #3)

The dragon, Tintaglia, released from her wizardwood coffin, flies high over the Rain Wild River. Below her, Reyn and Selden have been left to drown; while Malta and the Satrap attempt to navigate the acid flow of the river in a decomposing boat.

Althea and Brashen are finally at sea together, sailing the liveship Paragon into pirate waters to rescue the Vestrit family liveship, Vivacia, stolen by the pirate king, Kennit; but there is mutiny brewing in their ragtag crew and in the mind of the mad ship itself. And all the while the waters around the Vivacia are seething with giant serpents, following the liveship as it sails to its destiny…