Das Killer-Alphabet

Carola Seehagen, a course instructor at the adult education center in Essen, is found stabbed to death. Carola was the instructor of a beginner's course for illiterate people, which single mother Susi Zinsmeister was also attending. Mick and Andreas discover that Carola was dissatisfied with Susi's performance and therefore did not want to issue her a course certificate. This would have had disastrous consequences for Susi...