PB3 and his robot, Petra, are studying Earth;hellip; when evil aliens come and steal their spaceship! Can the children help PB3 get home, while hiding his presence from the news reporters? An exciting story of friendship and solidarity!Level 1br /Unique Words: extensivebr /Tense(s): presentbr /Glossary: yesCopyright 2015. German. Level 1. Elementary, Middle School. 6 x 8 inches. Softcover, 32 pages.