Father Brown seems unbelievably foggy on his church's teachings on monogamous marriage. Not a believable stance for an early 1950s priest... indeed for most Christian clergy in early 1950s.
Yes a bigamist appears...and murder etc. happens. Moderately entertaining plot.
However, I notice a pattern in this series.. Every now and then in this usually good...sometimes great..series. It's as if...the writers cant bear to fully present the actual theology of GK Chesterton's priest.
Remember again..a fellow great mystery writer, the great Dorothy L Sayers spoke of the underestimated power of actual Christian theology. "The Dogma IS the Drama"
Plot is ok...but not sparkling with the twists seen in their best episodes.