“Hellriser” (*1/2 out of four) was a slapdash, chintzy horror thriller that sadly isn’t as clever as its title set in London in which a veteran detective (Steven Dolton) and his young partner (Charlie Bond) investigate a series of brutal murders which leads them to an insane asylum under the domination of a sadistic doctor (Andrew Coughlan) and his experiments on patients. Low-rent horror story starts off as a slasher thriller and then merges into another boring story about the gateways to Hell although I guess that’s what you should expect from a movie with the title “Hellriser.” Dolton’s strong performance is wasted.