Twins Rich and Jade Chance are on vacation with their father, master spy John Chance—or so they think. The British government actually sent their father to keep tabs on a Swiss banker who is trying to escape from the Tiger, a ruthless criminal. But the banker is captured and taken to a remote Scottish castle—along with Rich! Now it’s up to Jade and her father to rescue them. Will they be able to stop the Tiger before Rich’s time runs out?