Dark (2017)

For the Lost fan whose favourite stretch was the time-jumping, Dark is the series that commits to it all the way. A missing child in the small German town of Winden pulls four families into a mystery spanning several generations, and keeping track of who is related to whom, and when, becomes the fun of the thing. Watch it in the original German with subtitles; the dub is distracting. This is the strongest answer on the list to the fear of an unresolved puzzle. Its three seasons on Netflix were planned as one story, and it ties up nearly everything it sets in motion.