Sentinel Trilogy Young adult dark fantasy trilogy. An underground society of guardians are mobilised against the devastating return of ancient dark forces, as a 15-year-old boy discovers his extraordinary destiny. View as: Grid List Show 50 All Sort By Position Name Price Publication Date 3 Item(s) Quick View Test Sentinel – T-Shirt £12.99 Add to Wishlist | Add to Compare Quick View Test Sentinel – Book One of the Sentinel Trilogy Add to Basket £6.99 Add to Wishlist | Add to Compare Quick View Test Ruins – Book Two of the Sentinel Trilogy Add to Basket £6.99 Add to Wishlist | Add to Compare View as: Grid List Show 50 All Sort By Position Name Price Publication Date 3 Item(s)