Almost eight months after her adventures around the world had concluded, twelve-year-old Sadie Meadows has been celebrating her birthday at home when 'The Book' pays her another unwelcome visit.
This time, it tells her that she will be taken to the various planets of the Solar System, one a year at the end of this and her next seven birthdays.
When she awakes, she finds herself on the surface of the planet Mercury, where she is given a task to complete before she will be allowed to go home.
Will she be able to fulfil her requirements, year-by-year, until she can finally go back for good?
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