I thought that she had fainted, but she recovered herself by a supreme effort.

"Is there no such thing as a gentleman?" she gasped.

"You do Sir Charles an injustice. He did burn the letter. But sometimes a letter may be legible even when burned. You acknowledge now that you wrote it?"

这句Is there no such thing as a gentleman这么分析和理解？这里的thing指“人”吗？麻烦老师具体分析一下这里的语法成分和含义。 谢谢！