Hearts of ice
(Juvenile Book)

"Two long-lost sisters. One chance to change their destiny. For as long as she can remember, Evangeline has felt someone missing, like a best friend who moved away, or an imaginary friend she's forgotten. She knows it sounds crazy, but the thought has always given her comfort--the idea that there's someone waiting for her, looking for her. Someone who cares about her. On her birthday, Evangeline finds her window has blown open, and her room is full of snow. There's a message written in the frost. One word. HELP. Evangeline learns that she has a sister, a twin, in fact. They were both born in another world--a land of snow and music and ancient magic. But now, the kinds wants his other daughter back, and will stop at nothing to lure her into the magical realm where danger lurks. The only way to stop him-and save her sister--is to summon powers Evangeline never knew she possessed. But will she learn to believe in herself before it's too late?"--Paragraph [4] of cover.