On behalf of ZDFinfo we produce two episodes of 45 minutes each. The series “Die Spurenleser” takes a look behind the scenes of spectacular crime hunts. Here, hidden behind laboratory doors and mostly literally in the cellars of forensic institutes, universities and research centres, scientists unearth the decisive clues and evidence for the conviction of the perpetrators. With their constantly evolving methods, they have become true heroes in the fight against the “perfect crime”.