Last week, both currently published Invisible Fiends book raced to the top of the Amazon children's horror chart, beating off competition from such big names as Darren Shan, Derek Landy and Stephanie Meyer.
Second-book-in-the-series, RAGGY MAGGIE, took the top spot, while MR MUMBLES sat in second place. Later in the day, however, the books switched places, with MR MUMBLES taking the lead.
As as result of racing so quickly up the charts, the books were first and second in Amazon's Movers & Shakers chart.

