"Utopia" by Lincoln Child.
Lincoln Child is better known for his collarorations with Douglas Preston, but this is a standalone thriller by him. The story involves a high-tech theme park being held to ransom by a gang of criminals; their fiendish plan is thwarted by a robotics expert working as a consultant at the park. Extremely enjoyable - I thoroughly recommend it.
Currently proofreading The Poison Belt, by Sir Arthur Conan Doyle.