'Half-Blood Prince' opens in Boston

From Left: Joanne Abi-Jaouve (Hermione), 18, of Westwood, Shara Ktz (Luna Lovegood), 18, of Hingham, James McGowan (Tom Riddle), 18, of Braintree, and Kat Rosenthal (Rolanda Hooch), 18, of Boston.
From Left: Joanne Abi-Jaouve (Hermione), 18, of Westwood, Shara Ktz (Luna Lovegood), 18, of Hingham, James McGowan (Tom Riddle), 18, of Braintree, and Kat Rosenthal (Rolanda Hooch), 18, of Boston.
Taylor Adams/Globe Correspondent