Baptism is a 2012 crime novel by British author Max Kinnings.

[1] The novel is mostly set on London Underground and follows radical religious extremists, led by Tommy Denning a psychopathic former soldier, who are seeking to "baptise" the train passengers by flooding the train.

Blind DCI Ed Mallory is the lead hostage negotiator and has to deal with the situation along with a rogue MI5 operative.

In The Times the book was praised as "a tense blockbuster with worryingly credible characters" while in the Peterborough Evening Telegraph the book was described as having "more twists than a bagful of snakes – and as much bite...A must read.

"[2] In Publishers Weekly the reviewer wrote that the book was "not for the faint of heart...Kinnings's thriller propels readers into the murk of London's Underground",[3] while in Eurocrime the book received a mixed review with the author writing: "for me the characters...are thinly realised and almost caricatured.