The inference is that Paul Helm told Agent Dewey about a mission that was planned for him by someone that Dewey didn't know.
What is an inference?
An inference simply means the conclusion that can be deduce based on the information given in a literary work.
In this case, the inference is that Paul Helm told Agent Dewey about a mission that was planned for him by someone that Dewey didn't know. Dewey thought it was a setup to get rid of him.
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