Plot: Paralysed from the waist down and unable to come to terms with the deaths of his wife and his little daughter, Joaquín, a self-imposed recluse and tech wizard, whittles down his melancholy by fiddling with electronic equipment in the shabby basement of his dilapidated house. Under those circumstances, however, when Joaquín reluctantly agrees to rent out an empty living space to the exotic dancer, Berta, and her silent daughter, it is not before long that the strange sounds and the muffled conversations coming through the wall will unearth a criminal gang's plan for a bank heist. But as Joaquín summons up his courage to ruin their plot, sudden and unforeseen revelations will drag everyone into a violent cat-and-mouse game where the light at the end of the tunnel is not always guaranteed.
Alternative Plot: A paraplegic computer engineer starts to hear noises and the voices of bank robbers in his basement.
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