In the plush Palais des Nations in Geneva, Switzerland, law officers are assembled to discuss the control of drug smuggling. Among them is the intrepid Inspector Henry Tibbett, using the occasion to combine business and a holiday with his wife, Emmy. But when an important official is found slumped across his desk, a dagger in his back, the investigation becomes uncomfortably intimate. The suspects are Henry’s colleagues, acquaintances, and dinner companions – and Tibbett finds himself unable to account for his whereabouts.