A kernel of truth phrase
A small amount of truth in something such as a story, speech, or statement, particularly when all other elements are invented.
After asking him a few questions, the police concluded there was a kernel of truth in what he said.
After listening to a gripping narrative of her journey up the Amazon, I know there is only a kernel of truth in it.
The origin of this phrase is not clear.
Seem to be very suspicious or morally unacceptable
This deal stinks to high heaven. Maybe somebody was bribed.