Dora (Chloe Rose) is an ordinary teenager who just wants to have fun with her boyfriend Jace (Luke Bilyk) Halloween. She is shocked when her doctor Henry (Rossif Sutherland) tells him that she is pregnant in four weeks – which Dora claims that would be impossible. Troubled, she goes home to wait for her mother while Jace leads the younger brother caroling. However, before her lover to appear, Dora is visited by some strange kids in costumes. Their presence is becoming more and more threatening and macabre. The reason is that they want a terrorizing her unborn child, so that Dora must fight against these monstrous children, but his task is complicated by the fact that pregnancy is progressing with extremely high speed, all natural.