This was like the first novel series I completed (almost) and I can say I could never have enough of it. Perhaps it was because I was so young or perhaps the detective thingies got my pulse racing, fulfilling my secret wish to myself become a detective, butI just loved it. Well written, pacy plots and a bunch of kids that got into all kinds of troubles and got out of it with such style, I preferred this to the other well-known and more widely-suggested series like the Hardy Boys and the Famous Five (which I for some reason, couldn't get to like, no matter how much I tried).
Thanks to the Children's Library that got me into reading novels (strange books without pictures they were to me then!) and hooked me up to this series I thoroughly enjoyed. 4 stars from me!