The Last Castaways is a 2003 children's book in The Last... series by Harry Horse.

It won the Nestlé Smarties Book Prize Silver Award.

[1] It is a humorous adventure tale told through a series of letters from Grandfather to his grandchild, a ship's log and a diary.

Grandfather and his dog Roo accidentally win their old ship, the Unsinkable, in an auction and go on a fishing trip.

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