Captifs looks like a solid and gritty entry into the world of French thrillers. The plot according to 24 Frames Per Second is as follows:
"Somewhere in Eastern Europe, Carole is a young nurse with a humanitarian aid group that has reached the end of its mission. But just then, the young woman and her two colleagues are kidnapped by strangers for mysterious reasons. Held captive, cared for and kept alive in an oppressive and sinister setting, the three prisoners soon discover with horror what their kidnappers truly have in store for them... "
The trailer, which can be viewed below, has hints of Martyrs and Vinyan flowing throughout. Despite a lack of subtitles, you can probably get a good idea of what's going on, as the plot appears to be relatively formulaic - a group of people in uncharted territory held against their will, etc etc. Clearly something bad is going to happen, we're just going to have to wait to find out.
Captifs will be released next month and is directed by Yann Gozlan.