A market traders van is hijacked and stolen on the moors. Nick starts to investigate and suspects Lord Ashfordly's son, who he later arrests for drink driving. Kate unintentionally starts a chicken pox epidemic when she starts a mother and baby group. Nick spots Claude wearing a brand new pair of boots several sizes too small which turns out to be part of market traders stolen stock. However, he doesn't think Claude is involved, but Blaketon disagrees. A local girl is pregnant and confides in Kate as to whom the father is. Nick later identifies the hijacker as Lord Ashfordly's new chauffeur, who also turns out to be the father of the local girl's baby.

The fair arrives in Aidensfield to the annoyance of local caravan site owner, Edna Plummer. It turns out that her caravan site is used as a convenient meeting place by her criminal brother. He is about to receive some stolen works of art from amateur smuggler, Norman Currie, who is on his way back home from a trip to Holland with his family. Currie's son takes one of the paintings and swaps it for free rides at the fair. Workers at the fair sell the painting to Greengrass who tries to sell it to Ferrenby who realises its true value and tells Nick. Meanwhile two 5 year olds go missing but return unharmed. Kate discovers the children had a mysterious friend, who turns out to be a local man whose wife and child were recently killed in an accident.