For two seasons, the question of Who Killed Sara? has been haunting fans of Netflix’s soapy Mexican thriller. More than once, the series has seemed close to solving its central mystery, only to pull the rug out from under viewers. But this season, the answers are finally coming. The show’s final episodes hit Netflix on May 18, and we’ve got all the answers to your questions — except the big one. Spoiler alert for Seasons 1 and 2 ahead!

What is Who Killed Sara? about?

Well, it’s all in the title. After his sister Sara is killed in a tragic parasailing accident, our protagonist Alex is betrayed by his friends, the powerful Lazcano family, and wrongly imprisoned for Sara’s murder. When Alex emerges from prison 18 years later, he’s ready to take his revenge on the Lazcanos and learn who really killed his sister — but the answers are more complicated than they might initially seem.

From left: Manolo Cardona as Alex Guzmán and Carolina Miranda as Elisa Lazcano in Who Killed Sara?

Who is in the cast of Who Killed Sara?

The sprawling cast includes Manolo Cardona as Alex (Sara’s wrongly jailed brother), Alejandro Nones as Rodolfo (Alex’s frenemy and Sara’s ex-boyfriend), Carolina Miranda as Elisa (Alex’s sometimes lover and Rodolfo’s sister) and Ximena Lamadrid as Sara. Under close suspicion is Rodolfo and Elisa’s father, César (Ginés García Millán), a multibillionaire who was having an affair with Sara when she was killed (she was also pregnant with his baby). Yes, you’ll probably need a family tree to keep track. 

Jean Reno as Reinaldo in Who Killed Sara?

Is anyone joining the cast of Who Killed Sara? in Season 3?

Yes! Joining the show this season are Rebecca Jones (Cuna de lobos, Días de combate) and Jean Reno (Léon: The Professional, Mission: Impossible, Da 5 Bloods). The exact nature of their roles remains to be seen, but we know Reno will be playing returning character Nicandro’s father. You can see some foreboding teaser footage of the pair on Netflix Latinoamérica’s Twitter page.

Where does Who Killed Sara? take place?

Who Killed Sara? is largely set and filmed in Mexico City, with some flashy resort sequences shot in Acapulco, Mexico’s largest beach destination. The notorious lake where Sara died is actually nearby Lake Avándaro.

From left: Claudia Ramírez as Mariana Lazcano and Eugenio Siller as Chema Lazcano in Who Killed Sara?

Is Who Killed Sara? based on a true story?

No. The outlandish plot twists of Who Killed Sara? are purely fictional. But creator José Ignacio Valenzuela did draw from his own experiences for certain plotlines: Chema and Lorenzo’s struggle to become parents as a gay couple was inspired by his own difficulties as a gay man growing up in Chile.

Ximena Lamadrid as Sara Guzmán in Who Killed Sara?

Do I need to watch the first two seasons of Who Killed Sara? to understand the new season?

Probably. The show takes enough crazy turns that it would be difficult to keep up without the added background of the first two seasons. Besides, you’d be missing out on quite a bit of drama. Why not catch up and come back?

So... who killed Sara?

Nice try. You’ll have to watch to get that answer.