2019’s Roses & Violets is the first volume of Gry Kappel Jensen’s Rosenholm Trilogy. The 2023 English translation is by Sharon E. Rhodes.
Four very different young women receive invitations to the mysterious Rosenholm Academy on Denmark’s Zealand Island. Maternal Chamomile; timid, sheltered Kirstine; grumpy Malou; and rich Victoria are all potential mages. Rosenholm can teach them how to safely use (Norse-flavored) magic.
Another way to look at it is that Rosenholm will provide a killer with potential victims.