Season 4 was an almost total waste
Yes we had the Mike Milligan theory with Loy's kid...but other than that what was the point? At least in Seasons 1-3 it was mostly off the rails after a slow start (except Season 1 which just started right out of the gate as nuts) but this dragged on slower than a soap opera plot line.
I hope they do better if there's a season 5 but if there isn't this was a VERY disappointing season.