Juniper, Gentian, & Rosemary — Pamela Dean

Inspired by a traditional ballad, Juniper, Gentian, and Rosemary is the tale of a mysterious young man and three ordinary young girls, of ancient magic and the modern world.

Three sisters live comfortably with their parents: Juniper, 16, who likes cooking and computer chats; Gentian, 13, who likes plays and astronomy; Rosemary, 11, who likes Girl Scouts. Enter Dominic, handsome as the night, quoting poetry, telling riddles, and asking help for a complex and fascinating science project.

Gentian isn't interested at first--she has her own life. But gradually her life, and her time, belong more and more to Dominic and his project, and her father begins to fear that the lad may be more than a charmer. . . .