The ending aside. I like this manga, can anyone give me some recommendations?
Hmm off the top of my head I enjoyed QED (Katou Motohiro), CMB (Katou Motohiro) and the Kindaichi series, the mysteries here are generally standalone though rather than an overarching one like this.
For ones with an overarching mystery, Tantei Gakuen Q (Shin Kibayashi, Satou Fumiya), Migi and Dali (Sano Nami), 20th Century Boys (Urasawa Naoki), Pluto (Tezuka Osamu, Urasawa Naoki) and Monster (Urasawa Naoki) were enjoyable - these last 3 are classics.
Hope these are a good start for you! I'll @ you if I think of more down the road - too bad I can't filter my completed list by tags haha