Things in apartment 43 are getting complicated for everyone: it's Sonia's birthday and Fran decides to spoil it by humiliating her in front of everyone. In the end, between cries, Sonia's dark secret comes to light, which causes her to run away from the apartment in order to end it all. But she isn't the only one who hides something. Meanwhile, Martha (Diego's ex-girlfriend who has just left prison) appears determined to resume their relationship, although he doesn't like it very much. On the other hand, the Clone of Emilio and Fucking Camel decide to prepare an assault to recover the artifact that's inside the backpack, but the plan doesn¿t go as well as they expected.