▁own ers ▁of ▁the ▁cars . ▁Jah n ▁sets ▁out ▁with ▁Gl ä ser ▁anyway , ▁but ▁he ▁leaves ▁her ▁when ▁he ▁gets ▁word ▁that ▁a ▁susp icious ▁man ▁( T imo ) ▁has ▁visited ▁Pia ' s ▁mother . ▁Gl ä ser ▁inter views ▁Sommer ▁alone . ▁Sommer ▁consult s ▁his ▁di ary ▁to ▁provide ▁an ▁al ib i ▁for ▁his ▁where about s ▁at ▁the ▁time ▁of ▁Sin ik ka ' s ▁murder ; ▁he ▁h ides ▁a ▁kn ife ▁on ▁his ▁person ▁in ▁case ▁she ▁acts ▁too ▁susp icious , ▁but ▁she ▁tent atively ▁accepts ▁the ▁al ib i , ▁though ▁she ▁puts ▁a ▁question ▁mark ▁next ▁to ▁Sommer ' s ▁name . ▁ ▁T imo ▁commits ▁suic ide ▁by ▁driving ▁a ▁car ▁into ▁the ▁lake ▁where ▁Sin ik ka ▁is ▁later ▁found , ▁and ▁afterwards , ▁Gr immer ▁bel ieves ▁that ▁T imo ▁was ▁the ▁sole ▁murder er ▁of ▁both ▁girls , ▁but ▁Jah n ▁is ▁not ▁convinced . ▁Following ▁this , ▁Sin ik ka ' s ▁body ▁is ▁found ▁by ▁a ▁sw immer , ▁and ▁her ▁parents ▁are ▁informed . ▁Jah n ▁real izes ▁that ▁Pia ' s ▁head ph ones ▁had ▁been ▁toss ed ▁from ▁the ▁passenger ▁side ▁of ▁the ▁car ▁after ▁her ▁murder , ▁and ▁that ▁means ▁that ▁someone ▁else ▁was ▁driving ▁the ▁car . ▁He ▁hypoth es izes ▁that ▁Sin ik ka ' s ▁murder ▁had ▁been ▁a ▁signal ▁from ▁the ▁other ▁man , ▁a ▁lon ely ▁ped oph ile , ▁that ▁he ▁wanted ▁to