MarthaandFélixarethechildrenoftheButcherofMons,anotoriousBelgianserialkillerfromthe1990s.Unstableandriddledwithinsecurities,Marthalivesvicariouslythroughsocialmedia.Herbrother,crushedbythefamilylegacy,takesovertheirfather'skillings.Harassedandviolentlyassaultedatwork,thedocileMarthafallsintomadnessandgoesthroughthelookingglassintothestrangeandterrifyingworldinhabitedbyherbrother.