The Black Arrow by Robert Louis Stevenson

Black Arrow is a swashbuckling portrait of a young man's journey to discover the heroism within himself. Young Dick Shelton, caught in the midst of England's War of the Roses, finds his loyalties torn between the guardian who will ultimately betray him and the leader of a secret fellowship, The Black Arrow. As Shelton is drawn deeper into this conspiracy, he must distinguish friend from foe and confront war, shipwreck, revenge, murder, and forbidden love, as England's crown threatens to topple around him.