Mica and Maru forgo their criminal past and their friendship to lead respectable lives on opposite sides of society. But the arrival of a mysterious envelope brings them back together.

Paola wants Maru and Mica to drug Romero and turn him over in return for her silence; the women at the NGO believe that there's something not right in Maru's past; Pablo thinks his wife is lying.

Maru and Mica are tired after multiple humiliating failures, so they decide to train two younger girls to charm Romero; Mica breaks into the gated community again to steal tranquillisers from Maru's neighbours.

Maru and Mica put all their focus into training the new Black Widows; the girls at the foundation become increasingly doubtful of Maru's real motives.

In order to learn more about Gussi, Maru and Mica break into his widow's house; Maru reunites with her mum at her house; Anto and Rocío discover something about Romero that compels them to alter their plan.

Maru deals with suspicions from Maggie and her own mother; Mica finally goes out partying with Antonella; Paola and Raquel try to reconnect.