Myka and her three BFFs have fun and work together in this fourth installment of the relatable and empowering The Invincible Girls Club chapter book series that fans of The Baby-Sitters Club will love! Myka's Gammy is coming to stay with her family for a few weeks, and Myka couldn't be more excited! Her grandmother has always been the person who understands her better than anyone else, and Gammy's visits include lots of quality time,...