The Flying Stars (The Father Brown Classics, Episode 4)

The Flying Stars" is one of Chesterton's mysteries featuring Father Brown. It's actually the first of these short stories I've read and I picked it up more because it's a Christmas mystery than to meet Father Brown, even though he is a character I'd like to read more of.
The story takes place at an English manor home on Boxing Day. A young lady and the young man who lives next door are present, as is the girl's father, Colonel Adams, a newly arrived uncle and a quite rich godfather. Also present, in addition to the servants, simply because the Colonel likes his company is the local priest, Father Brown. The godfather has brought a gift for the young lady, a set of three gorgeous, large diamonds, which he has tucked away in his coat pocket.