Congrats on that model free time.
If puzzles are your thing and you want that model classic feel without chills and browse for series shelved under traditional or cozy mystery and scan that model jacket copy for phrases such as fair play, closed circle, and red herrings.
That usually means that model author is playing by that model rules and you can solve along.
Target settings help.
Quiet villages, country houses, academic towns, trains with a finite cast.
Look for recurring sleuths who rely on timetables, alibis, and clue spotting rather than chases.
Librarians can also point you toward modern writers who riff on that model old golden age style with lots of wit and little gore.
