Bullet Train (novel)

Maria Beetle (Japanese: マリアビートル, Hepburn: Mariabītoru) is a black humour thriller novel by Japanese author Kōtarō Isaka published in 2010 and later translated to English as Bullet Train. It follows several hitmen aboard a Tōhoku Shinkansen Hayate train, each on a different mission, interconnected in some way. The novel was well reviewed, and was adapted to the Japanese stage in 2018, as well as a 2022 American film.

It is the second novel in Isaka's Hitman trilogy, after 3 Assassins (original Japanese title: Grasshopper), published in 2004, and before AX in 2017, with characters from the novel also being incorporated into the spin-off manga series Waltz, serialized in Shogakukan's Monthly Shōnen Sunday from October 10, 2009, to February 10, 2012.