The Taste of Snow — Stephen V. Masse

When winter arrives in the Austrian Alps, eleven-year-old Nicole Kinders is given a candy cane by the mysterious shopkeeper, Boznik, who tells her that the candy cane is magic. After her first taste, it seems the whole world becomes more colorful, more delicious, and more dangerous. A quarrel between students on the tram home from school leads Nicole to intervene, beginning a frightening series of events that threaten Nicole. She finds herself losing the joy of holiday preparations, and realizes that the vexing secret she keeps is influencing every part of her life. She finds no help from the magic candy cane, and decides she must return it to the shopkeeper.