The King's Park irregulars - David Wilson

When retired solicitor Alasdair Mills is burgled, the robbers leave behind his money and valuables, only stealing a pair of slippers that once belonged to Sir Walter Scott. Dismayed that the police are not taking the theft of his prized possession seriously, Alasdair turns to his old friend, the cunning Abigail Craig, for help. Donning disguises and hunting for clues, the pair turn detectives to track down the thief themselves. But the investigation takes a turn for the worse when Abigail and Alasdair stumble across something more sinister and realise there is far more to this case than a pair of missing slippers.