False Impression by Jeffrey Archer

A millionaire art collector and megalomaniac contrives to have people killed and wind up with their property without having to pay for it. He specializes in loaning money to people who have expensive art, and who won't be able to pay off their loans, especially not with the terms he negotiates. The book starts the day before 9/11/01, with him finalizing a "deal" that will bring him one of Van Gogh's self-portraits, worth tens of millions, for next to nothing. He runs into a snag, though, in that his office is in the World Trade Center. Though he escapes unharmed, he finds former and current employees working to sabotage the deal and see that the Van Gogh winds up in proper hands.