After a massive sinkhole swallows a nearby town, a school bus filled with students is dropped deep underground. After the crash, the students realize the bus is hanging precariously against the side of the sinkhole, held in place by a broken pipe. Any sudden move could send the bus plummeting into the darkness below. Alone and with all the adults injured, the teens struggle for survival with the story taking on shades of Lord of the Flies. Their only hope is a small-town paramedic, who must overcome a tragic past to rescue the students.

Jessica Day is an offbeat and adorable girl in her late 20s who, after a bad breakup, moves in with three single guys. Goofy, positive, vulnerable and honest to a fault, Jess has faith in people, even when she shouldn't. Although she's dorky and awkward, she's comfortable in her own skin. More prone to friendships with women, she's not used to hanging with the boys—especially at home.