The Chain by Adrian McKinty

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Featured on The Thread: 'The Chain' asks: How far would you go for your child?
"This nightmarish story is incredibly propulsive and original. You won't shake it for a long time."
STEPHEN KING
YOUR PHONE RINGS.
A STRANGER HAS KIDNAPPED YOUR CHILD.
TO FREE THEM YOU MUST ABDUCT SOMEONE ELSE'S CHILD.
YOUR CHILD WILL BE RELEASED WHEN YOUR VICTIM'S PARENTS KIDNAP ANOTHER CHILD.
IF ANY OF THESE THINGS DON'T HAPPEN:
YOUR CHILD WILL BE KILLED.