TV review: a visiting German professor turns out to be a committed Nazi party member

Nazi sa Ghaeltacht on TG4
(TG4 and TG4 Player) had me worried at the start.
I love the premise. A German professor of Celtic Studies visits Teileann in the Donegal Gaeltacht in the late 1930s to collect and record local folklore. There is talk that he is a Nazi spy, particularly when he is spotted taking photographs of the small pier in the harbour — handy if you ever want ed to re-stock a U-Boat. Add in the name of the show — —and your money is on Professor Ludwig Mu h lhausen being at least a bit of a spy.