Caidin became ill, so Max McCoy took over in 1995 and wrote the final four novels: "Indiana Jones and the Philosopher's Stone", "Indiana Jones and the Dinosaur Eggs", "Indiana Jones and the Hollow Earth", and "Indiana Jones and the Secret of the Sphinx". McCoy set his books closer in time to the events of "Raiders of the Lost Ark", which led to his characterizing Indiana as "a bit darker". The prolog of his first book featured a crystal skull, and this became a recurring story, concluding when Jones gives it up in the final novel. Lucas' involvement with McCoy's novels was limited, although LucasFilm censored sexual or outlandish elements in order to make the books appeal to younger readers; they also rejected the theme of time travel in the final book. Sallah, Lao Che, Rene Belloq and the Nazis made appearances, and McCoy also pitted Jones against Benito Mussolini's fascists and the Japanese. Jones also has a doomed romance with Alecia Dunstin, a librarian at the British Museum. A novel involving the Spear of Destiny was dropped, because Dark Horse Comics was developing the idea and later DC Comics developed the idea.