From bestselling author Katie Cotugno comes a charming new chapter-book series about a plucky seven-year-old who can see things other people miss, perfect for fans of Ivy & Bean

For as long as Penelope can remember, her grandma has had a super-secret pen pal. After years of wondering, Penelope and her sister Pearl are determined to find out who their grandma has been writing to all this time. Could it be Quinn, the glamorous tailor? Could it be Mr. Lee, the kind man who runs the grocery store?

Penelope can't wait to investigate this mystery with her sister, but the longer they look for the secret pen pal, the less excited Pearl seems. Can Penelope solve the mystery before Pearl loses interest, or has her sister outgrown their adventures together?