Question

The squire's glare neither frighten her nor stops her

Answer 1

The sentence "He left no stone unturned" is abnormal because it's an idiom. That means that there's really no affirmative version unless there's an affirmative idiom that means the same thing. "He turned over all stones" is the closest you'll come using the same vocabulary, but it's not an idiom even though it's almost natural and idiomatic: it'd have to be "He turned over all the stones" to be really normal.