The Spy in Black (1939) review

New school teacher Anne Burnett (June Duprez) sets off for the Orkney Islands to start work but she's chloroformed by Germans and "replaced" with Fräulein Tiel (Valerie Hobson), who's supposed to meet up with U-boat leader Captain Hardt (Conrad Veidt) and, a little later on, traitor Lt. Ashington (Sebastian Shaw) in order to sabotage the English ... but things don't turn out the way they were intended.  This WWI-set "thriller" is somewhat notable as the first ever collaboration between director Powell and Emeric Pressburger (who wrote the screenplay, which is based on the book by J. Storer Clouston), but it's highly uneven, taking roughly fifty minutes before it becomes clear what's actually transpiring ... and then an irate Veidt gets to really ham it up.  It's basically propaganda, "bragging" about how perceptive British intelligence is ("Rule, Brittania!" etc.), which is expected from an espionage-themed movie released at a very precarious time in history....