Single mother Maria falls from the clouds when the police come: She does not believe for a second that her son, Matis could have killed the pretty Lea from next door. He is in his early 20s, but still thinks and feels like a child - right? After his arrest, Simon finds a sex booklet belongs to him that the bus driver Bacher sold him. Matis actually makes a confession, to which, however, the psychologist Benjamin doubts. In the meantime, mother Maria is investigating on her own. The thriller gradually increases its level and excitement.

SOKO Leipzig is a German police procedural television programme, a spin-off of the earlier German police programme SOKO 5113. It was first broadcast on 31 January 2001, on German television channel ZDF. On 12 November 2008, the first part of a two-part crossover between SOKO Leipzig and British police procedural The Bill was aired, with the same version being shown on both ZDF and British television channel ITV1.