"Let Us Prey" follows a typical Midsomer Murders template.
When a female corpse is discovered in a river, it's Barnaby and his new partner investigating.
The woman is Nancy Dewar, who has just left her husband and moved in with an art historian, Philip.
Philip is restoring a frescoes at one of the local churches, and Nancy's death is like one found in a fresco. Philip has an alibi. Meanwhile, Rev. Hillcott decides the church needs money to preserve the frescoes, as the river is rising and they are in danger of being destroyed.
Nancy was supposed to sell her vote to the reverend, but dies before she can.
There are two more murders, both copying death shown in the frescoes. in the frescoes.
The river bursts and the community races to the church for refuge. Barnaby feels the deaths have to do with the sale of land, but it turns out there is a much deeper reason.
This was an okay episode, with some emphasis on Barnaby's pregnant wife. They're trying to recreate the success Tom Barnaby's family had on the show. Neil Dudgeon is pleasant and a smart detective, but the show has lost its pizazz at least with this episode.