SPUD – the Super Perceptive Undercover Detectives – have another mystery to solve! When there's a treasure heist on a school trip to the Tower of London, it's up to Callie, Grace and Bo to crack the case! Having magical hearing aids and a Spy in the Sky might just come in handy...
When Bo sneaks into Callie’s bag on her school trip to the Tower of London, she and Grace struggle to keep him a secret. But when precious treasure is stolen from the Jewel House, having a Spy in the Sky comes in handy.
