In Pursuit of the Curious Bangle (Electronic book text)

Lucy and James Corke, together with their uncle Dirty Monkey, 'a high flyer in the Big Smoke', as Lucy would put it, are led into a mysterious world, and soon find themselves hurled into a desperate situation. Everything must be done to protect the Bangle. The Authorities are on the trail, and whatever happens Lucy, James and Dirty Monkey, together with their newfound friends must not let the Bangle fall into the wrong hands, until they can unearth its secret.