A shocking discovery is made by Jane and Rafael regarding Petra. Michael finds a big clue.

Jane starts to go into labor after insisting that Xo and Rogelio go to Las Vegas for their show.

As Jane tries to juggle motherhood and school, she forgets to plan Lina's surprise 25th birthday party leading to friction between the best friends. Rafael tells Jane that he still wants a romantic relationship with her, but she is blindsided when he asks for joint custody. Petra tries to enlist Michael's help to keep Jane and Rafael apart. Rogelio's ex-wife, Luciana, is blackmailing him with secrets from years ago to get her role back on "The Passions of Santos." Meanwhile, Michael gets a new partner and a possible lead in the Sin Rostro case.

The Villanueva women have a tradition for Mother's Day and Jane is excited to get to participate in her first one as a mom. However, their plans are thwarted when Petra invites everyone to a brunch instead. Jane's TA position is put into jeopardy when a mysterious ad appears in the college newspaper. Rogelio is hurt when Dina doesn't invite him to her birthday party, so he asks Jane to help in an unusual way. Rafael finds himself in big trouble thanks to his half-brother. Meanwhile, Xo finds herself in a compromising position.

When Jane messes up at Mateo’s school, Petra convinces Jane to help with the preschool fundraiser to get in the good graces of the preschool’s director. Jane is excited for her first meeting with her editor, but he’s definitely not what she expected. Rafael’s girlfriend Abbey suggests moving in together. Petra is hiding a new relationship, but that’s not the only secret she’s keeping. Rogelio is being sued after quitting his reality show and hires a lawyer to help fix things. Meanwhile, Bruce asks Jane and Alba for help in surprising Xo.

Jane is having a hard time dealing with Rafael avoiding her, so when an issue with Mateo comes up she uses it to get some face time. Rogelio turns to Jane for help when he learns his pilot is in trouble. Alba and Jorge enlist Xo’s help to study for their upcoming immigration test. Meanwhile, Petra finally gets to the bottom of who has been terrorizing her.