To date it is the one of only five novels based upon the revived series that have not been published in hardcover: the second, Made of Steel, was published in March 2007; the third, Revenge of the Judoon, was published in March 2008; the fourth, The Sontaran Games, was published in February 2009; and the fifth, Code of the Krillitanes, was published in March 2010.
It is the 10th Doctor's final novel in the New Series Adventures (not including original audio books or Code of the Krillitanes).
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