Operation Robot Rescue (Library Binding) (ISBN-13: 9798765648346)

When Harper and her friends discover that their trusty robot, Marvin, has gone missing right before the big competition, the team must unravel the mystery. This action-packed adventure shows a world of teamwork, determination, and a dash of detective work. Will Marvin be found before time runs out?

Focus on the core phonics skill of r-controlled vowels in this engaging mystery.