Book review: Postern of Faith is a detective mystery novel from Agatha Christie, published in 1973. Postern of Faith by Agatha Christie is the fifth and the last in the Tommy and Tuppence mystery series, the amateur detective duo of husband and wife, now very much in their twilight years. The last case of Tommy and Tuppence sees them onve more diving in head first into intrigue and mystery with quick turns and surprises to follow…