... where they discover a woman has just witnessed a murder.

It would be easy to dismiss her claim; she saw something in the window of a house as the train went by, but when there are dangerous men waiting for her at Dundee station, Albert has to accept she might be onto something.

With the Gastrothief trail gone cold, Albert and Rex are in Dundee to sample the famous cake and learn how to make it. That might happen, but stepping in to defend the woman on the train, they soon find themselves embroiled in something far more sinister than they could have imagined.

Baking. It can get a guy killed.