you can not find many movie of this genre that be worth see and usually because either the screenplay isn not that good or the actor performance be bad . luckily and in this movie everything work like a clock . peter ustinov give u another great performance a he do in evil under the sun . the rest of the cast be not bad but some could have be a little bit well . the screenplay be very good but sometimes it lose control and the movie become a little bit boring and especially at the beginning and until the first death . to sum up and this be a movie that you see only once { know the plot ruin the whole movie that why i be not tell you it } and but be a thriller that everyone should see . i give it positive .