Sebastián (Ricardo Darín) is a successful lawyer in Buenos Aires and is in the middle of an important case. He has divorced from Delia (Belén Rueda) and they have two children, Luca (Abel Dolz Doval) and Luna (Charo Dolz Doval). Delia wants to move to Spain to live with her father and wants full custody of the children, but Sebastián is reluctant. Sebastián goes to Delia's apartment on the seventh floor of an old building to take Luca and Luna to school and Delia leaves the place. The siblings ask to go down playing on the stairs while Sebastián takes the elevator. When he arrives on the lobby, he realizes that the children have vanished. Sebastián needs to be in court for an important case but he seeks them out with the janitor and his neighbor Rosales (Osvaldo Santoro), who is a police detective. He calls Delia that returns to the building and suspects of everyone until a woman calls him asking for a one hundred thousand-dollar ransom in two hours. How can the desperate Sebastián raise this amount in a short time and who might have kidnapped his children?"Séptimo" is a tense and engaging thriller with a great idea but flawed conclusion. Sebastián destroys his professional life but let his wife go with one hundred thousand dollars and no other consequence? Delia should have an accomplice but it seems that her revenge on Sebastián was carried out alone. Did she keep her children on the fourth floor alone? How could she move in and leave the building with lookouts from the police and neighbors everywhere? My vote is seven.Title (Brazil): "Sétimo" ("Seventh")

I'm very puzzled by the mediocre and harsh reviews of this movie. Séptimo is a very good thriller. Definitely better than the 5.8 rating given on IMDb. Plenty of reviewers are being quite harsh saying Belén Rueda was unconvincing as the mother or the plot was weak or the kids acting was poor. But in the end, there are far worst movies with high ratings.Lead acting is very good with Ricardo Darín playing Sebastián and Belén Rueda playing Delia. Nothing spectacular but fairly strong and convincing. Supporting roles were rather mediocre and kids are rarely good actors especially if there are no drama scenes so there's nothing there. Cinematography was probably the weakest link here and it showed along with the modest budget. Aside from that, it is an enjoyable ride. Think about that literally, being take for a ride. Sebastián isn't the nicest guy, a slimy lawyer who puts his career and defending criminals above all. Except when his kids go missing and possibly kidnapped. Why? Shouldn't he have plenty of enemies? Probably the weak point in the script. But this film is a bit about what makes us human and realize what's important. The suspense is secondary, rather the traumas of life make us cling to what we appreciate, and even so more. If you are looking for a suspense movie, although some say it is Hitchcockian, it isn't in another sense. It's about life, separation and love. What we do to get what we want most. Real rating? 6.9 out of 10.0

Writer/Director Patxi Amezcua (with Alejo Flah as co-writer) presents this Argentinean thriller SEPTIMO, essentially a two person drama that is powerful and predictable – until the very well conceived ending. Sebastián (Ricardo Darín) and Delia (Belén Rueda) are divorced, have two children, Luna and Luca, and Delia is attempting to force Sebastián's hand for full custody of the children (the children are happy kids equally devoted to both parents. Sebastián arrives to take the children to school and Delia makes him promise to prevent the children from playing on the lengthy stairs that lead form the 7th floor to the lobby. Delia leaves, Sebastián gives in to the children's pleas to walk down the stairs, and the children go missing. Sebastián is a lawyer and must be in court for an important case, but when the children go missing he spends every moment looking for them – with a bit of help from the janitor and a police officer who lives in the building. Ultimately Delia is notified and the two await information from what appears to be a kidnapping. The children are finally released and the remainder of the film is a conflict that must not be shared in a review. Suffice it to say that the ultimate revenge served to Sebastián's wife is as devastating as the 'kidnapping'.Darin and Rueda find the right degree of friction and compassion in this well-constructed film. The story has been done before, but this version has true grit – and intelligence. Grady Harp, December 14

One more film, made ​​bad casting, child actors with a performance very weak, actually ... one disappointment. Ricardo Darin as in his later papers by a lawyer ... begins with a family (a couple) that is dissolving, Darin a performance very similar to usual, expressionless, does not transfer the tension and the impact it should have a episiode, as that would lose their children, with a performance, again, very poor. On the other hand Belen Rueda, fulfills its role in a more convincing, this movie has a twist ending that should mobilize, but the resolution that gives the character played by Darin, and little and bad acting of the children makes it a movie to see on DVD.