JK Rowling speaking in 2001
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JK Rowling secret book tops book chart

JK Rowling has secretly written a crime novel under the guise of male debut writer Robert Galbraith.

JK Rowling has secretly written a crime novel under the guise of male debut writer Robert Galbraith.

The Cuckoo's Calling has topped the Amazon book chart after its author true identity was revealed on Sunday.

Lizo Mzimba reports..