Morgan Brewster knows things. Things about the sinkhole outside his house which is growing bigger by the day. Only he knows why it is there and what lives within its black depths. Embry is a man ravaged by cancer. Frustrated by life, he is defiant in his determination to goad the disease into ending his torment and allowing him to die. As the sinkhole continues to grow and the residents of Maple Street begin to understand they are in grave danger, an unlikely bond is formed between Brewster and Embry against the danger which only they can stop. As the sinkhole continues to grow, the pair are dragged into a horrific battle against otherworldly creatures as they race against time to find a way to close the sinkhole and keep whatever resides inside from climbing out into the world...