''Prince Caspian'' - the second and last book with all four Pevensie children. They restore Caspian to his rightful throne.
''[[The Voyage of the "Dawn Treaders'' Treader" by C S Lewis|The Voyage of the "Dawn Treader"]] - introducing the obnoxious Eustace Scrubbs who needs Narnia's influence to become a better person. Reepicheep journeys to the Utter East. Read it and weep.
''The Silver Chair'' - the scariest of the series. Eustace and new Narnian visitor Jill journey underground with Puddleglum the Marshwiggle to try to save Prince Rillian, kidnapped by an evil enchantress.