Following a chance encounter with a young history student, Lance and Andy embark on a journey towards the discovery of a lifetime. All they need to do is get permission from the local landowner, the mad one who is rumoured to have done away with his wife.

Lance and Andy haven't told anyone that they are hot on the trail of the holy grail of metal detecting - the final resting place of King Sexred of the East Saxons. But members of the rival detecting club already seem to know all about it. Who is the mole?

Club president Terry is keen to help Lance and Andy search the bottom paddock at Bishop's Farm, but only because he's convinced that's where Larry Bishop has buried his missing wife. Meanwhile, Lance is determined to get his ex along to hear him play at the local pub's folk music night.

Terry announces that he is standing down as leader of the DMDC, unleashing a bitter winner-takes-all scramble for presidential power when Andy and Lance fall out over gold. Becky and Sophie are forced to become allies in the Two Brewers pub quiz. Is this Andy's worst idea ever?

A huge hole has been excavated and police are looking into it. Meanwhile, Larry Bishop's invisible dogs have disappeared without trace, and Andy and Lance now have one last chance to discover their hearts' true desire.