The Bewitched Baron — Lynn Collum

When Wyndom Long, Baron Newlyn, a noted botanist who pays little attention to the gaiety of the ton, engages Naomi Clayton as his shy sister's companion, he is startled by the girl he remembers as plain and reserved. Naomi is a sparkling presence in his home, where all sorts of odd things suddenly begin to happen, and a glint of innocent mischief in her eyes makes him wonder if love is meant to feel so magical...