When Bo sneaks into Callie's bag on her school trip to the Tower of London, she and Grace make plans to keep him secret. But when some gold coins and jewels are stolen from the site, having a spy in the sky comes in useful! The second hilarous instalment in the Major and Mynah series.

Karen Owen has been partially deaf since childhood, and wrote the character Callie in Major and Mynah to reflect who she wanted to be when she was younger - funny, clever and with a special gift to hear something that other people cannot. She was brought up in Kent and currently lives in London.