The Indestructible Man is a BBC Books original novel written by Simon Messingham and based on the long-running British science fiction television series Doctor Who.
It depicts a world modelled on television programmes created by Gerry Anderson, in particular Stingray, Thunderbirds, Captain Scarlet and the Mysterons (e.g. the indestructible man of the novel's title, the flying base of operations and the alien threat) and UFO (carried over to the cover in which Zoe's purple wig echoes that of the female Moonbase personnel in UFO).
The Doctor and Storm trace Verdana to a private hospice in Barbados, where his body is slowly wasting away, perhaps due to the hours he spent monitoring the Myloki's unfathomably alien signals during the war.
He is bitter that he's been condemned to this slow death while Matthews, a jumped-up clerk and chauffeur, became immortal; this is why he wrote the book exposing PRISM.
Richard McGinlay of sci-fi-online.com gives The Indestructible Man a mixed review, calling it "an intriguing book, but sadly not tremendously riveting.