Roleplay series. Six children become Cadets at a hidden high-tech emergency response centre. The children must quickly assess and resolve a major emergency, under the watchful eye of mentor 'The Commander', weighing up interactive briefings and video field reports. A volcano eruption on the Caribbean island of Montserrat takes the islanders by surprise. The cadets must find a group of missing tourists, deploy their rescue helicopter and then save the island's fuel resources from the lava flow.