Thanks to Craig Smorynski. He writes:`
"Astrid is a French crime drama about a severely autistic file clerk named Astrid whose photographic
memory and puzzle solving ability are put to good use by a detective Raphaelle who takes her on as a partner.
Aside from the drama, you should like the first episode as it features the 9 dots problem about using only 4 lines to connect
9 points arranged in 3 rows of 3 dots.
There is the obvious solution consisting of 4 lines connecting opposite points, but apparently that is not allowed because
the problem was improperly posed. The trickier solution consists of a piecewise linear "curve" constructed of the 4
lines and is revealed towards the end."