When Maud McIntyre and her assistant Daisy travel to a remote Scottish castle, the last thing they expect to find is a locked room murder mystery. Can they prise open this case and catch a killer?Scotland, 1912: When Maud and Daisy travel to Clachan Castle on the Isle of Mull to investigate the theft of a valuable statuette, at first the case seems straightforward. But when their prime suspect, bad-tempered fellow guest Mr Tremain, is found dead in his bed, the detective duo realise the castle is under attack...At first, it appears the murder is impossible. All the doors and windows to the room were locked from the inside, and there was no way for the killer to escape. But then Maud and Daisy find a secret panel with the stolen statuette hidden behind it, and learn that the mysteries are linked!When the local sergeant investigating the case is found dead, the crime suddenly seems to have more twists and turns than the castle's sweeping staircases. And with the estate full of potential suspects, Maud and Daisy must work fast to uncover the murderer. Could it be the castle's owner, Magnus Carmichael, avenging his stolen statuette? Or pretty Jane Tremain, disgruntled daughter of the deceased?Facing their most difficult case yet, Maud and Daisy must find the key to solving the mystery. But with so many suspects, which one will finally unlock the truth?An unputdownable historical whodunnit, perfect for fans of Helena Dixon, Verity Bright, T.E. Kinsey and Catherine Coles.