It's salutary, sometimes, to be harrowed by an evening's theatre. Jean-Paul Sartre's gripping drama of a group of French Resistance fighters interrogated by heavies of the Vichy regime certainly doesn't shy away from unrelenting human suffering.

Cleverly, it gets its scale just right, presenting us with few enough characters to become personally involved in the fates of these brave, doomed souls.

In a small, sweltering room - marks to designer Mamoru Iriguchi - the detainees await their individual summonses to the torture chamber. In their eerily desensitised voices, "life" and "death" become words like any other.

Is it, they wonder dispassionately, still useful to martyr themselves? If so, what about those comrades likely to squeal? In a moment of heartbreaking simplicity, they rise unsteadily to dance to a waltz emanating from their torturers' radio.

Mitchell Moreno's assured production swings around to show us the Milice, the more canny members of which are aware that the 1944 tide is turning against them. In a nerve-jangling cat-and-mouse exchange between jailers and captives, Charlie Covell's fierce Lucie bears her suffering so proudly that her torturers are baffled.

George Rainsford's François, the youngest of the band of brothers, twitches with paroxysms of nerves.

It's astonishing that this taut, relevant play hasn't been seen in London for 60 years. The Finborough's Rediscoveries season is living up to its title.

• Until July 7. Information: 0870 4000 838, www.finboroughtheatre.co.uk.