London police officer DC Hana Li is escorting Dr Matthew Nolan back to Beijing where he has been accused of a crime. However, on board flight 357, she finds herself embroiled in an escalating conspiracy and a growing number of murders.

Four guys on a bachelor party get off the subway at a station that shut down in the 70's and, after watching a transit cop get brutally murdered, find themselves running for their lives beneath the streets of NY.