LuluandJudyGeesoncontinuetheirearlierrolesandcometothefarewellparty.Thackerayannouncesthatheisleavingforaninner-cityschoolinChicagowherehewillteachagain.InChicago,hemeetsaformercolleaguewhoistheprincipaloftheschool.ThackeraylearnsthatthereisanAclasswithgoodstudentsandanH(for"horror")classfortheno-gooders.HeconvincestheprincipaltolethimtaketheHclassasaHistoryteacher.HisnewpupilsareHispanic,BlackandWhitekidswhoarenoisy,unrulyandengagedindestructivebehaviours.LikeinLondon,hestartsbyteachingthemsomemanners.HeaddressesthemasMrXorMissY,andexpectstobecalledMrThackerayorSir(hencethetitles)ccc　　Littlebylittlehelearnstheirpersonalstories:Wilsieisagangleaderwhoprotectshisyoungerbrother.Anotherisablackfemalewhobattlesagainstdoubleprejudice.Thewhitekidisgrowingwithoutparentsandhidesthistoavoidbeingfostered.　　WealsoknowabitofMrThackeray'sstory.AsateenagerinGuyana,hefellinlovewithaChicagogirlwhosefatherhadcometobuildamall.TheylostcontactandhewenttoBritaintostudy,becameateacherandgotmarried.Heisnowawidowerbutdecidedtotakethisteachingopportunitytofindhisearlierlove.　　Atschoolhesetsouttoteachthesetroubledkidsoftheirtruepotentialiftheytaketheirfateintheirhands.Heteachesaboutthenon-violentresistanceofthehistoricfightersofcivilrights.WhenhediscoversWilsiesmugglingagunintotheschool,heconfrontshimandconvinceshimtoyieldthegun.MrThackeraydeliversittotheschoolpolicemanasafoundobject.　　Later,thepolicepressureshimtogivethenameofthearmedkid,sincethegunwasinvolvedinacopkilling.Herefusestogiveupthenameofthestudentandhastoleavetheschool.　　Meanwhile,oneofhispupilshastakenajobinanewspaperanddecidestoinvestigateontheoldChicagoloveofThackeray's.Thegirlarrangesanappointmentforhim.Thackeraymeetsthesonofhisformerloveinahospital.Hismotherisill.Thackeraylearnsthatshelovedhimbackbutherfatherretainedallhisletters,becauseshehadgottenpregnant,sothatyoungmanhehadjustmetishisson.　　ThackeraylearnsthatWilsieishiddenbecausehethinksthatthepoliceareafterhim.HisbrothertakesThackeraytothehideawaytoexplaintherealsituationandavoidthatWilsieruinshislife.Throughcourageandtalking,theteacherconvincesWilsietoyieldhisnewgunandconfrontsarivalgangthathadcometofightWilsie.Wilsieandthefriendwhohadgothimthegunexplainthemselvesattheprecinct.　　Thekidshavebeendoinga"standin"andforcetheprincipaltoaccepttheirbelovedteacherback.　　UnliketheBritishfilm,thereisnoinfatuationwithhimamonghispupils,butafellowteacher(SaundraSantiago)admireshim.　　Thefilmendswiththegraduationceremonyanddance.MrThackerayannouncesthatheisnotgoingbacktoBritainbutstayingatChicagototeachthenewgeneration.　　--Wikipedia