"Looking back over the year, there was one salient feature that should be worrying all those who work in the art market. It is the number of lawsuits—some ongoing, others judged or under appeal—where art dealers appear to have acted fraudulently, mainly by selling works that were not theirs or selling the same work more than once."

Georgina Adam: Dodgy dealers beware: anti-fraud lawsuits are on the rise.