Thiên mệnh anh hùng (天命英雄), known as Blood Letter and Sword of the Assassin in English,[1] is a 2012 Vietnamese martial arts action fantasy directed by Victor Vu, produced by Phuong Nam Films and Saiga Films, in association with BHD.

However, on 19 September 2013, the National Cinema Department announced that the film did not meet the AMPAS criteria for distribution.

[2] Adapted from a popular novel Bức Huyết Thư by Bùi Anh Tấn, based on the life of Nguyễn Anh Vũ, a Royal court officer during the era of Emperor Lê Thánh Tông.

The film begins with a young boy arriving at the shore of a remote monastery.

Twelve years later, Nguyen Vu discovers his true identity, that he is the lone descendant of the nobleman Nguyễn Trãi, who was beheaded, along with the rest of his family, when he was implicated in the death of the King.