The case of the Cornish Patsy: a Druid Investigator mystery by Penny Billington

Britain's favourite Druid Private Eye is back! See the world through the eyes of a practising Druid as Gwion, robed and ready, is called once again to maintain the ancient harmonies.
Sent to magical Cornwall, he becomes implicated in human affairs and is marked man. As he acquires an entourage including girls, geese, giants and a fanatical geography teacher, he begins to realise that the Land itself is in peril - and where is Britain’s ancient protector?
Gwion’s crazy circus will traverse the length of the peninsula before the final showdown with the forces of evil, on May Day Morn.