“New Jersey Devil” (** out of four) was a competent but unexceptional horror thriller about a 16-year old (Veronika Babina) who is adopted by a sympathetic new family (Ryan Callaway and Clementine Benstock) but soon finds that there is a sinister and subversive force in her new household that threatens to endanger all of them. Decent production and acting cannot do much to enliven tired material which lacks any voltage of surprise. Callaway also wrote and directed.