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In page The Famous Five:

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Blyton originally planned to write only six or eight books in the series, but due to their strong sales and great commercial success, she ended up writing twenty-one full-length Famous Five novels, along with several other series in a similar style featuring groups of children uncovering crimes while on holiday.[1] By the end of 1953, more than six million copies had been sold. Today, more than two million copies of the books are sold each year, making them one of the best-selling series for children ever written, with sales totalling over a hundred million.[citation needed] All the novels have been adapted for television, and several have been adapted as films in various countries.