Agroupoftiredcommutershavecaughtthelasttrainhome,readytohopintotheirbedsforthenight.However,theirtrainsoonvrsoff-courseandcrashesintoanabandonedtunnel.Thethrsurvivingcommuters;withdrawnmotherYiLing,hersonLucas,andstudentJanice,areforcedtobandtogetherandsurvivethenight,aswellasavoidthemysteriousmonsterhuntingthem.YiLingstillsuffersfromflashbackstothecaraidentthatkilledherhusbandandnearlytookLucas`lifetoo.WhenLucasissnatchedawaybythemonster,hermaternalinstinctsaretested,andJanice`sideasoffamilyarechallengedassheremembersherdifficultrelationshipwithherestrangedfather.Backatthesubwaycontrolheadquarters,thnginrsdotheirbesttomakesenseofthesituationandrescuethesurvivors.
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