The Girl Who Kicked the Hornets' Nest (original title in Swedish: Luftslottet som sprängdes, literally, the air castle[a] that was blown up) is the third and final novel in the best-selling Millennium series by Swedish writer Stieg Larsson. The novel is the sequel to The Girl Who Played with Fire. It was published posthumously in Swedish in 2007 and in English in the UK in October 2009.
The US and Canadian editions published on 25 May 2010 are titled, The Girl Who Kicked the Hornet's Nest i.e. "hornet" is in the singular form.