Katie and the Great Twin Mix-Up — P. Katie Barkley

A long-lost friend returns to the Carter house for a visit, but something strange is afoot. Peter and his twin brother Jack seem to be mixed up in a mystery. When one of Katie's own family members gets mistakenly pulled into the danger, it becomes personal, and she takes a trip south to straighten things out. Can she unmix the mix-up? Find out in the next Katie Carter mystery story â€" Katie and the Great Twin Mix-up!