a mystery to (one)(redirected from a mystery to her)
a mystery to (one)
Something that is difficult to understand. Why she walked out in such a huff this morning is a mystery to me! She was acting normally before that. It was a mystery to scientists where the birds migrated to until they banded some of them and tracked their movement.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.