Warrior's Refuce (Warriors Manga: Graystripe's Trilogy #2) by Erin Hunter-Used

A manga adventure from the world of Erin Hunter’s #1 nationally bestselling Warriors series! In the second book of the Graystripe’s Adventure manga arc, follow ThunderClan warrior Graystripe after he is captured by Twolegs in The New Prophecy #3: Dawn— and embarks on a difficult journey home. As Graystripe and Millie begin their quest to find ThunderClan, they find that getting out of Twolegplace alive isn't nearly as simple as they thought. Millie isn’t used to life in the wild—and just when a temporary refuge is in sight, conflict with a tribe of barn cats threatens to break the travelers apart for good!