Twins Kensy and Max Grey’s lives are turned upside down when they are whisked off to London and discover their parents are missing.

Kensy and Max are now agents-in-training at Pharos, a covert international spy network. A school trip to Rome provides a welcome distraction from worries about their missing parents.

Kensy and Max are back in London where things begin to heat up – quite literally. So Granny Cordelia ships them off to Australia on an undercover mission at a posh Sydney school.