There are 3 books in the Deptford Trilogy series. The newest book is World of Wonders which came out in 1976.

1
Fifth Business

Book cover of Fifth Business
The first book in Robertson Davies's acclaimed The Deptford Trilogy, with a new foreword by Kelly Link

Ramsay is a man twice born, a man who has returned from the hell of the battle-grave at Passchendaele in World War I decorated with the Victoria Cross and destined to be caught…
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2
The Manticore

The Manticore

Hailed by the Washington Post Book World as "a modern classic," Robertson Davies’s acclaimed Deptford Trilogy is a glittering, fantastical, cunningly contrived series of novels, around which a mysterious death is woven. The Manticore—the second book in the series after Fifth Business—follows David Staunton, a man pleased with his success…

3
World of Wonders

World of Wonders

Hailed by the Washington Post Book World as "a modern classic," Robertson Davies’s acclaimed Deptford Trilogy is a glittering, fantastical, cunningly contrived series of novels, around which a mysterious death is woven. World of Wonders—the third book in the series after The Manticore—follows the story of Magnus Eisengrim—the most illustrious…