 Jef invites Jeanne s ex-cashier colleagues to her anger, as they are preying and jealous. This turns to panic when a mouse is found in the kitchen, hiding the corps for the students fails and they even spot others; Koen is near tears at so much cruelty to animals, but a premium per dead rodent makes the others eager to place mouse-traps and poison. When Billy buys a trap which catches them alive, Koen eagerly grabs his chance and hides the rescued rodent to pet it in his room, while the others hunt determinedly, in C-V s case because of a phobia the senior can t admit, in Betty s case so delighted with the money that she even imports dead white lab mice from the faculty...