Piper can understand animals. Their voices guide her back to her wealthy birth family, where everyone favors the adopted daughter, Lucy. After Lucy frames her and tries to make her disappear, Piper escapes with help from a group of mice. Deep beneath the mansion, she finds a mysterious girl who looks exactly like Lucy—and calls Piper her sister. If this is the real Lucy, who has been living upstairs, and why did she steal another girl’s life?
