This Isn't What It Looks Like (Playaway Children)

In this fourth and second-to-last book in the series, Cass and Max-Ernest set out on separate, yet equally dangerous, adventures. Cass finds herself alone and disoriented, a stranger in a dream-like, medieval world. With the help of a long-lost relative, she begins to uncover clues and secrets--piecing together her family's history as she fights her way back to the present world. Meanwhile, back home, Cass is at the hospital in a deep coma. Max-Ernest knows she ate Time Travel Chocolate--and he's determined to find a cure. Can our expert hypochondriac diagnose Cass's condition before it's too late? And will he have what it takes to save the survivalist?