The Mystery of Montague Morgan by Karen Baugh Menuhin
I have been reading/listening to this series since the beginning and always enjoy them. Lennox, our sleuth, is a war hero who is now one of those gentlemen who have money but not a job, so of course, he solves mysteries. This time around he's helping his friend, retired Scotland Yard Detective Swift. Swift's family makes whiskey, but their broker has disappeared, with their money. The mystery leads the pair to an island where they get snowed in with a group of people - one of whom is a murderer. Oh, and they have to solve the case quickly so Lennox can make it to his Christmas Eve wedding.
I enjoyed the story, but I'm already invested in Lennox and Swift. There are a lot of characters, from the friends staying at the house to the staff, and the plot was rather convoluted. We got love affairs and murder and smuggling and plenty of secrets. I guess there was maybe too...