Argentine star Ricardo Darin and Spain's Belen Rueda will star in "Septimo," a mystery set to begin shooting next month in Buenos Aires, the film's producers said Thursday.

The plot revolves around an estranged couple's desperate search for their two children, who mysteriously disappear from the building where their father lives.

It is the second feature for Spanish director Patxi Amezcua, whose 2009 suspense story set in Barcelona, "25 kilates," was honored at the Malaga Film Festival.

Besides Darin and Rueda, the cast includes Luis Ziembrowski, Jorge D'Elia and Manuel Callau.

The Spanish-Argentine coproduction will be filmed entirely in Buenos Aires and is due for release in the second half of 2013. EFE