Original: OEL manga series Graystripe's Trilogy There is a three volume original English-language manga series following Graystripe, between the time that he was taken by Twolegs in Dawn until he returned to ThunderClan in The Sight.
Simplified: Warriors manga Graystripe's Trilogy There is a three book manga series based on what happened to Graystripe between the time that he was taken by "Twolegs" in Dawn until he returned to ThunderClan in The Sight.