|aOperation twin trouble|cby Ray O'Ryan ; illustrated by Jason Kraft.
|aFirst Little Simon hardcover edition.
|aNew York|bLittle Simon|c2015.
|a119,  p.|bill.|c19 cm.
|aContains excerpt from the next Galaxy Zack series "Science Fair Disaster".
|a"Zack's twin sisters are best friends, but when the two get into an argument while visiting another planet, Zack finds himself stuck in the middle of a tricky twin situation"--|cProvided by publisher.