▁wife ▁five ▁months ▁earlier . ▁Mitt ich ▁takes ▁an ▁interest ▁in ▁the ▁new ▁case , ▁but ▁he ▁is ▁blocked ▁from ▁particip ating ▁by ▁the ▁new ▁senior ▁detect ive , ▁Matth ias ▁Gr immer , ▁who ▁ins ists ▁on ▁doing ▁things ▁his ▁way , ▁even ▁when ▁he ▁is ▁wrong . ▁ ▁A ▁flash back ▁shows ▁the ▁initial ▁meeting ▁of ▁Pia ' s ▁murder er , ▁Dan ish ▁national ▁Pe er ▁Sommer , ▁and ▁his ▁companion , ▁a ▁student ▁named ▁T imo . ▁The ▁men ▁form ▁a ▁bond ▁as ▁Sommer ▁shares ▁his ▁collection ▁of ▁por n ographic ▁films , ▁including ▁one ▁that ▁shows ▁the ▁ab use ▁of ▁an ▁ad oles cent ▁girl , ▁with ▁T imo . ▁ ▁T imo ▁leaves ▁after ▁Pia ' s ▁murder , ▁to ▁Sommer ' s ▁dis may . ▁ ▁Mitt ich , ▁the ▁retired ▁detect ive , ▁vis its ▁Pia ' s ▁mother ▁and ▁rails ▁against ▁the ▁false ▁hope ▁that ▁detect ive ▁Gr immer ▁holds ▁out ▁for ▁Sin ik ka ' s ▁parents , ▁who ▁grow ▁increasing ly ▁ups et ▁at ▁the ▁lack ▁of ▁progress ▁in ▁the ▁investigation . ▁ ▁T imo , ▁who ▁has ▁married , ▁taken ▁his ▁wife ' s ▁last ▁name , ▁and ▁had ▁two ▁children ▁of ▁his ▁own , ▁is ▁now ▁an ▁architect . ▁Upon ▁hearing ▁of ▁the ▁new ▁murder , ▁he ▁leaves ▁home ▁and ▁makes ▁his ▁way ▁back ▁to ▁Sommer . ▁Sommer ▁is ▁glad ▁to ▁see ▁his ▁old ▁friend ▁and ▁says ▁that ▁he ' d ▁tried ▁un success fully ▁to ▁find ▁T imo ▁after