There is a mystery surrounding the invitation by Craddock Fitch to the Big House. It is billed as a celebration of his business, but when everyone is assembled, they find that it is a lavish wedding reception for two very surprising people. With these festivities over, the inhabitants of Turnham Malpas are thrown into preparations of a different nature. It is the 150th anniversary of the village school and Kate, the head teacher, is arranging a big event. She enthusiastically starts making plans, but there is one problem of which she is unaware. In asking the previous head teachers to attend, she has unwittingly placed the rector and his wife Caroline in an impossible situation...