▁directed ▁by ▁Claude ▁Ch ab rol , ▁based ▁on ▁the ▁novel ▁The ▁Th in ▁Line ▁by ▁Edward ▁A ti y ah . ▁Aud ran ▁won ▁the ▁B AF TA ▁Award ▁for ▁Best ▁Act ress ▁in ▁a ▁Le ading ▁Ro le ▁for ▁her ▁role ▁at ▁the ▁ 2 7 th ▁British ▁Academy ▁Film ▁Awards . ▁ ▁Plot ▁Charles ▁Mass on ▁( B ou quet ), ▁an ▁advert ising ▁ ▁account ▁executive , ▁is ▁having ▁an ▁affair ▁with ▁Laura ▁( D ou king ), ▁the ▁wife ▁of ▁his ▁best ▁friend , ▁world - ren owned ▁architect ▁François ▁Tel lier ▁( P é rier ). ▁Their ▁sex ▁life ▁consists ▁of ▁sad omas och istic ▁behavior , ▁and ▁in ▁one ▁of ▁their ▁he ated ▁sessions , ▁Charles ▁accident ally ▁str angles ▁Laura . ▁Comple t ely ▁confused , ▁Charles ▁leaves ▁the ▁borrow ed ▁a partment ▁in ▁Paris ▁and ▁runs ▁into ▁François ▁at ▁a ▁nearby ▁b istro . ▁The ▁two ▁drive ▁back ▁together ▁to ▁Vers a illes , ▁where ▁they ▁have ▁beautiful ▁ad jo ining ▁houses ▁designed ▁by ▁François . ▁The ▁owner ▁of ▁the ▁a partment ▁had ▁seen ▁Laura ▁and ▁Charles ▁together ▁two ▁months ▁earlier , ▁but ▁she ▁does ▁not ▁tell ▁the ▁police ▁because ▁of ▁François . ▁Even ▁though ▁the ▁police ▁do ▁not ▁seem ▁to ▁have ▁any ▁cl ues ▁to ▁the ▁crime , ▁Charles ▁has ▁a ▁difficult ▁time ▁cop ing ▁with ▁the ▁situation , ▁and ▁tries ▁to ▁lead ▁a ▁normal ▁life ▁with ▁his ▁two ▁children ▁and ▁lov ing ▁wife ▁H él ène ▁( A ud ran ). ▁