Object clauses after
a. μή clauses denote a fear that something may or might happen; μὴ οὐ clauses denote a fear that something may not or might not happen. Observe that the verb is negatived by οὐ and not by μή, which expresses an apprehension that the result will take place. μή is sometimes, for convenience, translated by whether; but it is not an indirect interrogative in such cases.
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].