Antunes, Neves and Cruz want to continue producing "sugar", but have lost the group's cook. Isabel, a PJ researcher, became aware of the substance after Margarida was admitted to the hospital. The group of friends is threatened by Raposo and needs to deliver the missing order to him. They are looking for a new cook. Bernardo appears to have the profile they are looking for.

Bernardo agrees to produce the "sugar", but he needs to decode the correct formula and laboratory equipment. The only solution is to raid the faculty's laboratories. But Margarida, a colleague of Bernardo's, also wanders around the laboratories all night long.