A 20. század elején játszódó sorozat főszereplője Julio, aki eltűnt testvérét kívánja felkutatni az illusztris Grand Hotelben, mely a gazdag és óriási hatalommal bíró Alarcon család tulajdonában áll. A mindenre elszánt fiú álnéven pincérnek áll, hogy testvére nyomára bukkanjon.

Julio runs into the final test confirming that his sister has not left the Gran Hotel; Someone has tried to burn Cristina's bloody clothes in one of the hotel kitchens. A test that seems to confirm Julio's suspicions; Cristina is dead ... but ... who was to blame? And ... does this have something to do with the young woman who has just been killed in town? Meanwhile, the Alarcón family, attends to the evolution of Sofia who, after having fallen down the stairs, fears for the future of her son.

Julio is closer than ever to find out who murdered his sister and the main suspect is none other than Diego, Alicia's fiancé. Without proof to prove it, Julio will only have one possible path for his investigation; find the author of the anonymous Diego, the only person who can shed light on the death of Cristina. However, in parallel, Detective Ayala is following another clue: that of the weapon with which Jimena's murder was committed. The famous gold knife that appears in Javier's room, which was also the last person with whom the prostitute was killed. All indications point to the young Alarcón.

Julio's investigation into the death of his sister Cristina turns around after a serious incident. Aided by Alicia, the young man will have to check his belongings for a test that will guide him to the murderer. Meanwhile, Ayala is convinced that Pascual is the murderer, so he allows Javier to get out of jail and return to the hotel. The young Alarcón has managed to get rid of his problems once more, but the tranquility does not last long. Sofia and Alfredo also get things upset. The marquis wants to organize a hunt at the hotel to gather the great aristocrats. But Diego is not willing for Alfredo to take any merit.

Detective Ayala has discovered Julio's true identity and appears at the hotel looking for the young man. Meanwhile, at the Gran Hotel, Alicia and Diego's relationship seems to begin to consolidate after Diego saved the young woman from dying at the hands of Pascual. But the arrival of an old family acquaintance will awaken Diego's insecurities that he is willing to fight for Alice until the end. It is not the only problem facing the hotel manager; Sofía and Alfredo gather the courage to start fighting Diego and make Alfredo take his rightful place inside the Gran Hotel. For his part Eugenia, Javier's fiancee, discovers young Alarcón in bed with another woman. Eugenia's anger is unleashed upon discovering that it is about Mercedes, her own sister.

Julio Olmedo a vidék közepén álló Grand Hotelbe érkezik, hogy nővére eltűnése ügyében nyomozzon. Állást kap pincérként, és találkozik a tulajdonos vagyonos lányával.

Julio, aki végtelenül boldog, mivel újra találkozott a nővérével, megtudja Cristinától, hogy a lány eltűnése egy olyan levél miatt történt, mely elég erős volt ahhoz, hogy megrengesse a Grand Hotelt.

Miután zsákutcába jutottak a nyomozásai, Julio megkéri Aliciát, hogy hagyjon mindent, és szökjön el vele, és a nő végre egyszer készen áll, hogy a szívére hallgasson.