Ronny proves very useful, tracing Gwen's signet ring's origin. Dani keeps looking, Tom gets drunk and refuses all collaboration with IA, which only makes him look more suspect. Jean and Jimmy are called in as witnesses when a man's apartment is opened, but find him murdered; tracing his suspicious, unemployed neighbour, they stumble across a presumed pedophile porn network. The search for Gwen Callens makes dramatic progress...