It's a cause for celebration when a thriller writer passes such an incredible milestone.
When I first released Impeding Justice there were days when John Locke's book 'Lethal Experiment' and mine used to leap-frog each other in the thriller chart. It was the first book I looked at every morning when I checked the rankings in the chart, if I managed to get ahead of John I knew that I'd had a good day. ;-)
I can only dream of having the success he's had, to sell over a million copies of his books in only five months is an incredible achievement.
Long may it continue for you John, a wonderful writer who deserves much success.
John you're an inspiration to every kindle thriller writer.