noun
a person who plans and directs a complex and intricate scheme or project
verb
to plan and direct a complex and intricate scheme or project
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The mastermind behind the elaborate heist was finally apprehended by the authorities.
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I heard that John was the mastermind behind the surprise party for Sarah.
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The crew knew that Joey was the mastermind when it came to pulling off the perfect prank.
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She was the mastermind of the operation, carefully orchestrating each step to achieve success.