A truly enjoyable serie, Kagi no Kakatta Heya is perfect for the Summer. It's episodic, which allows the viewer to watch one episode today and the next in a week without either forgetting the plot or severing any narrative thread. Should you decide to watch it, you can let your heart rest and only use your brain: this is a logic quiz, not a rollercoaster of emotions. The cases revolve around how the crime was committed: Who and Why are almost irrelevant. It's perfect for a break from emotion-filled dramas, or for a weekly/daily 45 minutes of pure distraction. As already pointed out by other reviewers, each episode is built upon a fix pattern, with a brief presentation of each locked-room case in which the improbable investigative trio gives us hints to solve the riddle. If you aren't a fan of serial doramas, you may find the repetition boring. Personally, now and then I like the familiarity created by schemes and patterns: it's... reassuring, and relaxing. The actors do a great job. Sato Koichi's antics are hilarious, Ohno Satoshi's robotic ways surreal but very effective in creating a familiar character and yet leaving that trace of mystery which keeps the interest of the viewer alive. I'm partial to Toda Erika because every time I see her on screen she is different. This time it took me almost half an episode to truly recognize her; I once read that she's one of the few drama actresses, if not the only one, who is ready to act with no make-up at all. Her clothes are so discouraging it's evident she does not want to impress for her looks, but for her acting skills. The editing of this show is original: it cuts scenes and music abruptly. In the beginning I thought it was a mistake by the segmenters, but I later realized it's a direction choice. While I wouldn't recommend this kind of style for every drama I watch, I think it works well here, where no room is left open for unnecessary detail and economy prevails over flowery narration. The music is brilliant and works perfectly for the show. It combines some elements of the traditional detective/mystery serie a' la Ellery Queen with the contemporary pace and rhythm. It can be rewatched, given some time has passed and you've forgotten the intricacies of how the culprit did what (s)he did. I didn't mind the ending at all, I thought it was very much in line with the rest of the show. Suitable and therefore recommended to any type of viewer of every age.