Robert Louis Stevenson 
Kidnapped 
Being Memoirs of the Adventures of David Balfour In the Year 1751 How He Was Kidnapped and Cast Away; His Sufferings in a Desert Isle; His Journey in the Wild Highlands; His Acquaintance with Alan Breck Stewart And Other Notorious Highland Jacobites

Originally written as a "boys’ novel", Kidnapped has attracted the praise and admiration of writers as diverse as Henry James, Jorge Luis Borges, and Seamus Heaney. Solid historical and environmental background, and gritty realism give the novel immediacy while also the book also shows the importance of friendship and loyalty.