Those books were the ****ing best. They're no longer in production, are they?
I remember the first one I got was "House of Danger" for my 11th birthday. I got all freaked out after I ended up dead. I told my mom and she was like "Maybe you shouldn't be reading those if they're going to scare you." Subtext: Don't be a *****, son.
My favorite one was that Harold Thromberry one, where you're an investigator trying to find out who murdered some rich dude.
As much as I loved those books, they pretty much started to suck after 25 or 30. The first few books were amazing, with like 30-plus endings. They started getting chintzy at the end. it went from "WITH MORE THAN 30 POSSIBLE ENDINGS!!!" to "WITH SOMETHING CLOSE TO FIVE POSSIBLE ENDINGS!!!"
I still look forward to passing those books down to my nephew, though.