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A brand new adventure from the world of The CluesFor years the Cahills have been the most powerful family in the world For years theyve protected the source of their power - the Clues And for years theyve kept their secrets silent Until nowThis extraordinary stand-alone novel cracks open the Cahill vault to tell the story of the most coveted piece of artwork in the world a masterpiece that has been the target of seven separate theft attempts Jan van Eycks altarpiece at Ghent OPERATION TRINITY chronicles the first Vesper attack on the altarpiece in the s then jumps to WWII and young Grace Cahills desperate bid to save the masterwork from the Nazis The final piece of the novel tells the story of Ian and Natalie Kabras first solo operation and features an th hour appearance by Grace Cahill on her final missionHistory will never be the same.