Angela Gulbenkian was on a tear. In the summer of 2017 the German-born art adviser spent $10,500 to charter a private jet; $3,920 at the Hotel Café Royal, in London’s Soho neighborhood; $16,985 at Harrods; and $2,610 at Agent Provocateur. She also made stops at Rolex, Gucci, and Christian Louboutin. […]