Eduardo is obsessed with his new toy, an airband transistor radio. His obsession is so intense that his girlfriend Clara is driven to despair. Eduardo no longer pays any attention to her, even in their most intimate moments, so she decides to play her strongest card: she tells her mother so that she can get her son back on track. However, things don't turn out quite as Clara had planned. Something truly terrible is about to happen, something that will change their lives forever.