The Weekend Murders is disconcertingly British. It's not just that this Italian giallo is in UK English but that the setting, style and even the lame quaint humor are all indicative of a mid-century cozy English mystery-comedy.
I must say that i was completely taken by surprise by who the murderer is and what method they used. However, this isn't unusual in Agatha Christie mysteries which totally cheat and throw so many red herrings at the reader that the end is usually a nice surprise. Either you get it or you don't, no review on Earth will talk someone into the sheer relaxing enjoyment of watching a formulaic mystery set on a European estate where you'll never be able to figure out the murderer by discerning the clues.
This effort is solid, the cinematography and musical score are lovely, but in a very mainstream MGM sort of way.