First sequels are the true test of an enduring movie franchise, and "Harry Potter and the Chamber of Secrets" passes with flying colors. Expanding upon the lavish sets, special effects, and grand adventure of "Harry Potter and the Sorcerer's Stone", Harry's second year at Hogwarts School of Witchcraft and Wizardry involves a darker, more malevolent tale (parents with younger children beware), beginning with the petrified bodies of several Hogwarts students and magical clues leading Harry (Daniel Radcliffe), Ron (Rupert Grint), and Hermione (Emma Watson) to a 50-year-old mystery in the monster-laden Chamber of Secrets. House elves, squealing mandrakes, giant spiders, and venomous serpents populate this loyal adaptation (by "Sorcerer's Stone" director Chris Columbus and screenwriter Steve Kloves), and Kenneth Branagh delightfully tops the supreme supporting cast as the vainglorious charlatan Gilderoy Lockhart (be sure to view past the credits for a visual punchline at Lockhart's expense). At 161 minutes, the film suffers from lack of depth and uneven pacing, and John Williams' score mostly reprises established themes. The young, fast-growing cast offers ample compensation, however, as does the late Richard Harris in his final screen appearance as Professor Albus Dumbledore. Brimming with cleverness, wonderment, and big-budget splendor, "Chamber" honors the legacy of J.K. Rowling's novels. "--Jeff Shannon"