Sherlock Holmes famously once investigated the case of the dog that did not bark, now the art world is puzzling over the Giacometti that did not sell.
His 1955 bronze bust of his brother Diego had been given a reported estimate of $70 million - making it the most expensive work on offer in this week's New York auctions - but it fell flat last night.
Bidding was opened at $59 million and there was obvious surprise in the room a few minutes later when Sotheby's auctioneer Oliver Barker pulled the plug as it became clear no bids would come in.
It comes 24 hours after rival auction house Christie's withdrew a $30 million Andy Warhol work, Big Electric Chair, when it became apparent it would not sell. Sotheby's insistence on keeping the Giacometti in the sale suggests they were confident it would find a buyer though some experts speculated it was over-priced and a $50 million valuation would have been more accurate.
Last night's headline sale came courtesy of Picasso's Homme assis which sold for $15.1 million, while the sale as a whole brought in $186.4 million - below the pre-sale low estimate.
You can see how last night's results have affected the wider market through our live data here.