“La Impostora” is an endearing romantic story with a touch of classic melodrama, set in Playa del Carmen, the heart of the Mayan Riviera. The story follows the adventures of Blanca Guerrero, a good-looking and witty aspiring actress who makes a living as a waitress in a picturesque restaurant that caters to tourists. Blanca gets her big break when she is hired by famous Hollywood actor Adriano Ferrer to pose as Victoria San Marino, a millionaire investor from New York. In this role, she will infiltrate the powerful Altamira family with the secret intent of discovering the whereabouts of a son that Adriano had twenty years before with Alexandra, a now-deceased daughter of the Altamira. Adriano’s scheme is put in jeopardy when Blanca falls in love with Eduardo, the handsome and charismatic scion of the Altamira clan. Blanca Guerrero (Lisette Morelos), is cheerful and resourceful girl with a big heart, who works as a waitress, dreaming of an acting career. At an early age she was helping his father Memo much as she could, considering that the early lost her mother. When Memo was unjustly fired in the company of family Altamira, where he worked for years, Blanca decided to talk to the owner, the old Leonidas. This goes to a costume party, organized by his family, and thanks to the acting talent managed to infiltrate the skin refined ladies of high society.

She will meet Raquel Altamira (Christian Bach), daughter of Leonidas, a cold and calculating woman who fired her father. In the public eye she is a widow who cherish the memory of her late husband. Everyone thinks she's devoted mother who tries to provide only the best to her sons, dearest Eduard, shy, but very ambitious Cristobal, the dreamer Jorge, who leads a double life . However , Raquel Altamira (Christian Bach) in reality is the opposite of all this - is manipulative and does not stop at nothing to achieve their goals. Blanca and Eduardo also be introduced at a party, where they spend a romantic moment, hiding her identity mask. Life of the humble waitress will completely change when they show up at the celebration of a rich businessman Adriano Ferrer (Manuel Landeta), who years earlier had an affair with Raquel's younger sister Veronica. Adriano accuses the Altamira family for the death of his beloved Veronica, not knowing that she is in fact alive, but it was detained in a psychiatric hospital on the orders of her older sister.

Ferrer then offers Blanca an offer she can not refuse, promising her that he would help her fulfill her dream of becoming an actress, if she plays the role that it is intended to uncover all of secrets in the Altamira family . Specifically, she needs to get into the skin of Victoria San Marino (Lisette Morelos), a millionaire investor from New York and under the same name get into a partnership with the family Altamira. When Rakelino gains confidence, she must find out what happened to a child who was Veronica was born and for which Adriano for years unsuccessfully searching. Blanca agrees to assume someone else's identity, although she is aware that it can cost a life, if Rachel finds out, and things get even more complicated when he realizes he's in love with Eduardo, who chased and ex-girlfriend Mariana.