Now in his fifties, Richard Hannay is called upon to fulfill an old promise. Haraldsen, an acquaintance from Hannay's days as a British spy, is dying, and demands that Hannay protect his son, Valdemar, who is about to inherit the secret to a great treasure. But enemies from Hannay's past, including the infamous D'Ingraville, want in on the prize and will stop at nothing to get their hands on Valdemar. With the help of his old allies and teenage son, Peter John, can Hannay keep Valdemar, and the secret treasure, safe?

The Richard Hannay series, including The Thirty-Nine Steps, Mr. Standfast, The Three Hostages, and Greenmantle, established John Buchan as an original thriller writer and pioneer of espionage fiction. The Island of Sheep is the fifth and final book in the series.

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