Then, just when that was blowing over, there was the matter of Clevinger’s plane disappearing so mysteriously in thin air with every member of the crew, and blame for the strange mishap centering balefully on him because he had never signed any of the loyalty oaths.
There are no more uses of "mishap" in the book.
Show samples from other sources
We tripped while roller skating, but survived to laugh at the mishap.
We’re dealing with your mind, and the slightest mishap in what you’re thinking or interpreting or perceiving can render the resultant findings worthless."