Janet Markham is starting to feel almost settled at the bed and breakfast she owns with her sister, Joan. When their neighbour and gardener, Stuart, tells Janet that he thinks someone might be growing plants for illegal drug manufacturing in Doveby Dale, Janet insists that they go straight to the police. Stuart agrees, but only if they visit the farmer he believes may be providing the land for the operation first.

A visit to Martin Lawley’s farm raises more questions than it answers, though. It seems obvious that something suspicious is going on, but what?

Can Janet work out what Martin’s stepson is really up to? Can Aggie, Janet’s clever kitten, help identify the criminals? And can Janet and Joan deal with their most difficult guests yet?