 I rate this episode ★★☆☆☆ for BELOW AVERAGE. I'd would give props to Sam Dann for thinking creatively for writing mystery stories, but this CBSRMT episode seems far-fetched. It's not the worst, but it's not the greatest either. It was clever for using the word "mosca" as the villians' last name because "mosca" is the Latin word for "fly." Tammy Grimes made her contribution as the Hostess in this tale, but not as good as E.G. Marshall did. In her Prologue, she explains that we win some, we lose some, but it doesn't quite build up the suspense. In ACT-1, she introduces our 2 main characters and left it at that. Then in ACT-2, not enough suspense or mystery to go around. Then in ACT-3, she asks us fans what really happened to our minor characters. The only good thing I did like, was her Epilogue about venturing out to the unknown, which makes sense, since we do venture into this great radio series and tune in whenever we can for another mystery. The sound effects of the rush hour traffic on 5th & Jefferson, flipping pages of newspaper ads, door knocking, flies buzzing loudly, engine motor running, the soothing music playing in the Moscas home, and the fly swatter were effective in this tale. SPECIAL NOTE: at the 39-minute 4-second mark, there's a painful static, so cover your ears. There were dramatic melodies in ACT-1, sinister & eerie tracks in ACT-2, and chilling tunes in ACT-3, so the music was effective as well. Fred Gwynne (as Lou Valentine), Evie Juster (as Lil Valentine & Mrs. Mosca), and Bernard Grant (as Mr. Mosca & Benny The Writer) were all satisfactory in this. These 3 have done tremendous work on other episodes before, but for a story such as this, these 3 deserve a better mystery. The Acting, Music, and Sound Effects: GOOD. The Script and the Hostess's Contribution: FAIR. As I said before, it's not the worst, nor is it the greatest. But I do recommend this episode to anyone who is fan of Fred Gwynne.