I'm currently reading the Arséne Luping saga, and it's even better that i thought. A lot of people like Lupin 3rd and Kaito Kid, but i don't see many fans of this saga. It has great mysteries, and interesting situations with a resolve that leaves you more than satisfied. Without mentioning that Lupin is one awsome main character, always smiling and being silly, while remaining a genius.
"That is life", he said. "When one knows how to use one's eyes. Adventure exists everywhere, in the meanest hovel, under the mask of the wisest of men." - The Eigth Strokes of the Clock, from the Arséne Lupin series.