Death-Cast is the fictional organization in Adam Silvera's novel They Both Die at the End responsible for informing individuals they are going to die within the next 24 hours.
Here's a more detailed explanation:
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Role and Function: Death-Cast's primary function is to call "Decker's," those who are predicted to die on that given day, and notify them of their impending death.
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Mystery and Source of Information: The workings of Death-Cast are shrouded in mystery. Neither the Deckers nor the Heralds (employees) know how Death-Cast determines who will die. The source of their predictions remains unknown.
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Impact on Characters: The existence of Death-Cast profoundly impacts the characters' actions and decisions, particularly those who receive the call, encouraging them to live their final day to the fullest.
In essence, Death-Cast is a pivotal plot device exploring themes of mortality, fate, and the human response to knowing one's expiration date.