Paulo Coelho. Mata Hari. Spy (№ 294580)

don't let yourself fall in love. Love - poison. Once you fall in love and you are no longer the owner of his life, your thoughts, your heart belongs to another man. Love threatens your existence. You go to save someone you dear and can't see the approaching danger. Meanwhile, this inexplicable diabolical invention called love gradually erases everything that was you, and leaves you instead of the creature that would like to see the object of your feelings.