" ... Piper and Peter Post love to send postcards to their pen pals, but most of all, they love to intercept mysterious postcard messages! But what about one that starts out "Dear alien?" What can that mean? To get to the bottom of things, mom and the kids rumble off in their SUV on a SETI (Search for ExtraTerrestrial Intelligence) to see if a LGM (Little Green Man) is really behind the suspicious postcard". Includes trivia on aliens, and highlights SAT words important for kids to know.