When two unpublished 18th century manuscripts are re-discovered, they appear to authenticate the events described in Sunsphere, the most recent mega-selling novel by Mark Arden, the author of blockbusting historical conspiracy thrillers. Had Arden inadvertently stumbled upon a genuine great secret when he wrote his multi million seller? And is there, as the manuscripts seem to suggest, a real mystery to be unravelled?

Convincing themselves there must be, three investigators set out to follow the trail of clues that begin in the country house where the first manuscript was discovered. Here...