Apple TV Plans 'Silo' Spinoff Based on Hugh Howey's Books

• Apple TV is reportedly planning a 'Silo' spinoff.
• The spinoff will be tied to Hugh Howey's upcoming Silo book trilogy.
• Pre-production for the spinoff is expected to begin later this year.
• The books are expected to be released next summer.
• Hiring has already begun, and some sets remain standing after season four wrapped in March.