核心问题
in secret 与 in the secret 有无区别?
词典解答
in secret 是指“秘密地”“私下”“暗地里”“偷偷地”：
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The miser buried his gold in secret and no one knows where it is. (DAI) 守财奴把他的金子暗地里埋藏了起来，谁也不知道他的金子放在哪里。
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I was told about it in secret. (OSD) 他们把这件事秘密告诉了我。
in the secret 是指“知道内情”“知道这个秘密”:
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I was in the secret from the beginning. (Chambers) 从一开头我就知道这个秘密。
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“Mother is terribly angry with Dad,” said Thiry. “You see, she was not in the secret.” “母亲对爸爸非常生气，”西里说。“你瞧，她原来一点也不知道内情。”
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Is your brother in the secret? (ALD) 你弟弟知道这个秘密吗？
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Do you think it's wise to let him into the secret? (DEC) 你认为让他知道(参与)这个秘密是明智的吗?