On the eve of college graduation, six best friends embark on an epic weekend to celebrate—but it takes a fatal turn. Nearly 20 years later, the survivors are reluctantly reunited by a blackmail text threatening to expose the truth about that fateful night.

Marina Quiroga, a daring upper-class girl with a detective’s soul, sets off to catch the serial killer that has been terrorizing her town with her faithful butler Hector’s help.

In 1920s Madrid, four women at the National Telephone Company ring in revolution as they deal with romance, envy and the modern workplace.