The murder of "Manenbaum" attracts the interest of local police and eventually the persistent Investigating Judge Annemarie Livi (Tilda Swinton). She becomes absorbed by the case, not discouraged by the lack of assistance she encounters from official sectors. Livi forms an alliance with the similarly dedicated Colonel Roux (Jeremy Northam), a senior French Gendarmerie investigator, and the pair initially suspect that "Manenbaum" was part of a Jewish assassination plot. They discover that Brossard has been the subject of several previous investigations, dating back more than 40 years, which have all failed. Livi and Roux discover hidden resources, tightening the noose around Brossard, who finds his allies increasingly reluctant to help him. Doubts arise over the theory of a Jewish hit squad, but it is clear that "someone" wants Brossard dead.