The house was not easy to find. The boat journey to get to it started on a windswept pontoon next to a busy highway in Istanbul. “It’s like visiting James Bond,” Ömer Koç’s secretary had joked, but tales of his masked balls and exotic art collection, coupled with the two silent boatmen at the helm, made it feel more like a trip to the Magus. Koç is a scion of one of the richest families in Turkey.

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