Night Birds On Nantucket by Joan Aiken

Shipwrecked Dido Twite, picked up by a whaling ship, finds herself many miles from home and facing deep troubles. Sinister Miss Slighcarp, the governess from Willoughby Chase, makes a reappearance, this time is cahoots with Hanoverian plotters who have a dastardly plan in mind.
Binding: Paperback / softback