In "MacKenzie's Magic," Linda Howard draws readers into the violent and deadly world of the hard, dangerous MacKenzie clan; Debbie Macomber's warm and funny "Silver Bells" proves that "what goes around, comes around" as Carrie Weston falls victim to the same teen-age matchmaking scheme she used years earlier; and in Linda Turner's "A Wild West Christmas," the Rocking R Ranch hosts an unexpected and prickly reunion.