Gary Brandner’s horror novels come to life again in this direct-to-video sequel to “The Howling.” A number of vicious murders occur in a small California town after a motorcycle-riding stranger arrives. The gruesome slayings look disturbingly like the work of a werewolf. Meanwhile, in another nearby town, police are hot on the trail of a killer they believe is a werewolf. This is “Howling” with a country-western angle.