Lux can't stop stalking. He finds out that Alex and his gang are actually using the app he coded for drug dealer. He secretly collects the drug stock and gets rid of it. At the BDE Christmas party, Lux who managed to get closer to Alma tries his luck with her.

Computer science teacher Herzig investigates the stalker. He suspects Lux, his best student, but cannot prove anything. It was Lux who finally cornered Herzig when he discovered he was a black hat. However Alex now has something to blackmail Lux.