How to use "spy" in a sentence

When they found a letter in his pocket which proved that he had been sent to spy on them, they tied him to a post inside the inn,

'You can have your spy.'

"Army Intelligence? You were a spy?"

'The Count is a spy!'

When she was gone, I said, 'Oh, Laura! You shouldn't have called the Count a spy!'

Perhaps Pesca knew the Count? Perhaps the Count really was a spy - a spy in a much more important sense than Laura had intended when she called him by that name.