Warriors manga: warrior's refuge

Describes the adventures of Graystripe, a former leader of ThunderClan, as he struggles between staying with his adopted Twoleg family and embarking on a quest to find his lost feline companions.
Graystripe and Millie's journey to find ThunderClan has only just begun when the pair is faced with a series of obstacles that seem insurmountable. Getting out of Twolegplace alive isn't nearly as simple as expected, and Millie's unfamiliarity with life in the wild makes it a challenge for Graystripe to keep them both moving forward. But just when a temporary refuge is in sight, conflict with a tribe of barn cats threatens to break the travelers apart for good!