Countdown (Special Agents, #3)

Danny, Maddie and Alex are trainee special agents with Police Investigation Command. When they're briefed on an 'ice-cream war' at first they think it's some kind of joke. But when they hear that thugs and enforcers are moving in on legitimate licence-holders of ice cream and hot dog vans and that traders are being beaten up and even murdered, they know that there's danger on the streets. Link this with visiting politicians and attending a performance at the Royal Albert Hall, plus the protection of a priceless jewel…it's no surprise that the three teenage agents have a major protection job on their hands.