A pair of small-time crooks, Wayne Todd and Fraser Hood, who met in jail are reunited when Wayne leaves London after being threatened by a thug and travels to Glasgow to look up his old cell mate.
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.