like: das Geheimnis → →
das Geheimnis ☊ 
bí mật ☊ 
☊ He loved the magic and mystery of the place. ☊ magic ☊
Shall we let him in on (= tell him) the secret? ☊ secret ☊
What's the secret of your success? ☊ success ☊
das Geheimnis ☊ bí mật ☊ ☊