The Unknown Girl ★★½

"If I'd opened the door, she'd be alive, like me"; "That's true, but you're not the one that killed her". The moral conundrum is laid out unusually baldly in this tale of Adele Haenel, dedicated doctor and Girl Detective, rushing around at the usual frantic Dardennes pace making phone calls, answering doorbells and figuring stuff out (a young boy's heart-rate provides the first clue!) - but the urgency feels increasingly hollow this time, driven only by the next bit of plot, and when people finally reveal themselves they do it through confessional speeches, not significant actions like in the Brothers' best movies. Mediocre, even by lower standards.