This must be one of the least interesting thrillers ever made!
It only runs 90 minutes and you can feel that several scenes were cut which results in a botched-up movie that never delivers. I think the movie only "thrilled" me once and even with a good job by Jessica Lange the movie failed to convince me. And the ending was definitely the worst ever for a thriller.
Helen is the young girlfriend of good-looking Jackson Baring. When Helen gets pregnant and marries Jackson, they decide to move to his hometown, Kilronan, and have a baby there. But his mother Martha, who lives there, starts to do weird things, and obviously she's not too friendly to Helen.