《嫌犯第三季》ArtteacherAbigailLincolnisfounddeadatthesixthformcollegewheresheworkedbyhandy-manHarryWebster,amanwithaconvictionforviolence,whohadrecentlybeensackedforharassingAbigailforbeingaLesbian.AtthesametimeCharlielearnsthatAbigailwasabouttoreporttheprincipal,RoryO’Hanlon,forhavinganaffairwithstudentMelissaParkerwhilstRory’sstepsonDylanhadbeensendingAbigailabusivetexts.MelissaiscaughtonCCTVdisposingofthemurderweaponbuttherewillbeanotherdeathbeforethepolicesolvethecase.