Somewhere in South America, at the home of the country's vice president, a lavish birthday party is being held in honor of Mr. Hosokawa, a powerful Japanese businessman. Roxanne Coss, opera's most revered soprano, has mesmerized the international guests with her singing. It is a perfect evening -- until a band of gun-wielding terrorists breaks in through the air-conditioning vents and takes the entire party hostage. But what begins as a panicked,...