A Gordian KnotIn this the third novel in the Dominic and Barbara series, Director Whitte of the EACD asks them to 'look into the off the books sales of significant art works' that, by some estimates, cost European governments 'tens of millions of euros per year in tax avoidance'. The daylight murder of their initial contact changes the scope of the investigation from primarily an academic exercise into a three continent trek into the past, where they find an art trove ready to fund the resurgence of a twentieth century scourge.