This debut novel does not seem to be available in any other format in the US except TOPAZ for the Kindle (I assume it is TOPAZ, since the filesize isn't shown). However, it is available in ePub in the UK e.g. from
WHSmiths. They sell to anyone from anywhere, and the Adobe ePub will be readable directly on a PRS-505 or 700. It isn't free, but it gets good reviews (e.g. on Amazon).