In the late 19th century, on board a ship sailing from Jamaica to England, Olivia Harwood, a recent widow, takes on the task of caring for several malaria patients, including Mark Bellis, a mysterious and tormented painter.
A Dutch company's owner bankrupts his own company, burns the incriminating ledgers and plans to run to Paris with the company funds but he is caught in the act by his accountant who challenges his actions, leading to a reversal of roles.
A socialite poses as a Nazi spy to mask her activities as a British agent.
