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From the liner notes

A lucky real estate agent... A decomposed body... A building full of greedy neighbors...300 million hidden in the cellar... Something smells rotten in this house. Julia finds 300 million pesetas hidden in a dead man's house while selling an apartment. She's a 40-ish real estate agent (played by Carmen Maura) now forced to face the wrath of a very peculiar community (of neighbors), headed by an unscrupulous administrator. Black humor gives way to suspense, closely followed by horror that doesn't take long in coming to a head in undisguised pandemonium.