Amateur detective Molly McQueen's life is changing fast. Her parents are moving to Australia and they want Molly to go with them. But if she does, it will mean the end of the employment agency she's built. Molly and a friend plan a weekend in Pitlochry.
On the last day of their visit, they go for a walk, finding a man that has tumbled down a steep hill and has serious head injuries. He hands her a pouch and tells her to 'warn them'. 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?