CodeofSilenceintroducesustoDeafcateringworker,AlisonWoods.She’sstrugglingtomakeendsmeet,jugglingtwojobs,inapolicecanteenandalocalbar,whilealsodoingherbesttosupportherDeafmum,Julie.WhenDCAshleighFranciscallsonAlisontolipreadtheconversationsofsomedangerouscriminals,sheisplungedintoanewandexhilaratingworld.Alison’sinterpretationofthegang'sclandestinemeetingsquicklybecomekeytounlockingthepoliceinvestigation.ButAlison'sfeelingsaboutthecasebecomecomplicatedwhenshefindsherselfdrawntoLiam,oneofthemainsuspects.Alisonknowsshe'sputtingherselfatriskbyagreeingtoworkwiththepolice,andwhenthingsthreatentospilloverintoherpersonallife,sheknowssheshouldstepaway.ButAlisoncan’tletgo…