June, 1870. The world-famous author Charles Dickens has been found dead in his summerhouse where he had been hard at work on his final, unfinished novel, The Mystery of Edwin Drood. Did he die of natural causes - or is there something more sinister behind his sudden demise? George Sala, Dickens' biographer, is convinced his friend was murdered - and he has hired Grand and Batchelor to prove it.

Could Dickens' death have something to do with his unconventional private life? Who is the mysterious woman who appears at his funeral?

If they are to uncover the truth, Grand and Batchelor must leave no stone unturned. But are they prepared for the shocking secrets some of those unturned stones will reveal . . .?