Dall'alto di una fredda torre

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Elena and Antonio discover that their parents have a very rare disease. Their only hope for survival is a stem cell donation that must occur in a very short time, and their children are the only suitable candidates for this particular procedure. Elena and Antonio prepare for the operation, but Antonio discovers that he's not a match for the donation, and Elena's stem cells are not enough for both of them: it's not possible to cure both parents.