a dark secret
All charming people […] are spoiled. It is the secret of their attraction.
Can you keep a secret?
Darkness favors secret dealings
deep dark secret
Don’t ever let him into a secret, because he always spills the beans
I let him/her into the secret.
I'll keep your secret.
It's a big family secret.
It’s not a state secret
Music is the perfect type of art. Music can never reveal its ultimate secret.
person behind a secret operation or crime
secret of success
to be in the secret
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