It's almost Christmas! Elisa and her family have just bought a Christmas tree when suddenly, they witness an attack: a man dressed as Santa Claus has just attacked a passerby! The man collapsed into the crowd as the assailant fled. Quickly notified, Commander Rocher takes up the case: it seems that the victim has been poisoned with a particularly toxic product and his days are numbered. The DYP team is then faced with a unique situation: a murder investigation... whose victim is still alive!
