When Ellie Baum accidentally time-travels via red balloon to 1988 East Berlin, she's caught up in a conspiracy of history and magic. She meets members of an underground guild in East Berlin who use balloons and magic to help people escape over the Wall. But even to the balloon makers Ellie's time travel is a mystery. When it becomes clear that someone is using dark magic to change history, Ellie must risk everything--including her only way home--to...

Polly's visit to her grandparents in Connecticut becomes an extraordinary experience as she encounters old friends and mysterious stangers and finds herself traveling back in time to play a crucial role in a prehistoric confrontation.