n the summer Martin and Padraic started to build a raft on which they intended to sail into town. Now, as Halloween approaches, they decide to turn it into their own spooky ghost ship and take to the water, with their two imaginary friends, to the strains of the only sea shanty they know - 'Orinoco Flow'. However the tide carries past the town and they end up on the seemingly uninhabited Castle Island - uninhabited, that is, except for Island Joe. Meanwhile old-fashioned Father Roche is opposed to pregnant, unmarried Fidelma taking readings in church but the progressive Father Linehan comes up with a way around his objection.

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