In post-war Vietnam, a talented piano student and doctor in training begin a doomed love affair.

A police officer receives a worn-out and traumatised woman who begs him to take actions against a ruthless man that ruined her life, and only gives his moniker, Tín Mã Nàm, meaning “crazy horse” in Cantonese. As the officer sets out to search for Tín Mã Nàm, a network of intricate crimes, espionage and bloody murders beyond his imagination begins to unfold.

After an unexpected break up, a travel executive accepts an assignment to go undercover and learn about the tourist industry in Vietnam. Along the way, she finds adventure and romance with her Vietnamese expat tour guide and they decide to hijack the tour bus in order to explore life and love off the beaten path.