This could have been a lot better. Stephanie Zimbalist and Simon Dutton are good as the leads with romantic sparks. The rest of the cast is good, but the script does not give them much chance to show their talents.
The main problem is with the pacing. The set-up to the story is interesting, but the action really drags at times, especially near the end. On the plus side, this is a basically enjoyable little movie, and a reminder of the now-vanished art form of the network TV-movie! I think it would have been more fun, had the producers chosen to set it in the 1920's or 1930's, prime Agatha Christie periods; but perhaps budget issues made them make it contemporary.
Bottom line: a modest, fairly enjoyable light mystery with some humor, and two leads with charm. Not a standout mystery film, but not bad.