Amateur detective Molly McQueen's life is changing fast and she has some big decisions to make. Her parents are moving to Australia and they want Mollly to go with them. But if she does, it will mean the end of the employment agency she has worked so hard to build.
Before she decides, however, Molly and a friend plan a relaxing weekend in Pitlochry to visit Deanna, who has a summer role with the Festival Theatre. On the last day of their visit, they go for a walk through the hills at Killiecrankie and come upon a frightening scene. A man has tumbled doen the steep hill and has serious head injuries. As her friend goes for help, Molly stays with him. Then, unexpectedly, he hands her a pouch and tells her to 'warn them'.
Those two words set in motion a chain of events which leads to one of the most baffling and challenging cases Molly has ever faced. Can she find out what it all means, and what will she decide to do both with her own life and with McQueen's Agency?