After dropping her son off at the bus stop, the doting mum and high school science teacher, Jessica Martin, is kidnapped at gunpoint, and thrown in an unknown attic with only a nearly unusable phone. As her world turns upside down in an instant, the desperate mother manages to jury-rig the device and connects with the cell phone of the young college student, Ryan. Now, Jessica's life is literally in Ryan's hands--and as the ruthless abductors threaten to kill her--Ryan has to act fast to rescue the woman on the other end of the line. However, with a dying battery, how can Ryan save Jessica when this could be her last phone call?