Sophie Gallagher drives a tour bus on the island of Guernsey, with nothing more important to consider than how to show off the sleepy little island to its best advantage, and perhaps her eventual marriage to her partner, Assistant Harbourmaster James Candish. But when she picks up from the airport a group of Arab visitors, Sophie's suspicions are aroused by the strange behaviour of her guests. When she uncovers the truth she can hardly believe it, for the plan is to hold the entire island to ransom. Having taken control of the infrastructure and planted bombs at strategic points, the terrorists also kidnap the island's leading figures and inform the British Government that they will commence shooting if their demands are not met.