Charm School — Cate Martin

Amanda Clarke thinks of herself as perfectly ordinary in every way. Just a small-town girl who serves breakfast all day in a little diner nestled next to the highway, nothing but dairy farms for miles around. She fits in there.
But then an old woman she never met dies, and Amanda was named in her will. Now Amanda packs a bag and heads to the big city, to Miss Zenobia Weekes' Charm School for Exceptional Young Ladies. And it's not in just any neighborhood. No, she finds herself on Summit Avenue in St. Paul, a street lined with gorgeous old houses, the former homes of lumber barons, railroad millionaires, even the writer F. Scott Fitzgerald. Why, Amanda can practically hear the jazz music still playing across the decades.
Scratch that. The music really, literally, still plays in the backyard of the charm school. Because the house stretches across time itself. Without a witch to protect this tear in the fabric of the world, anything can spill over. Like music.
Or like murder.
"Charm School", Book 1 in the Witches Three Cozy Mystery series. If you're a fan of Amanda M. Lee, N.M. Howell, or Amy Boyles, this mélange of magic and murder mystery is sure to charm you.