Subsequent plays include Kill the Old Torture Their Young (Traverse, 1998), which follows a disparate group of characters across an unnamed city, mixing realism with poetry and fantasy.
Presence (Royal Court Theatre Upstairs, April 2001) takes another look at the Beatles' residency at the Indra club in Hamburg on the eve of their success, and Dark Earth (Traverse, August 2003) begins as a broad comedy and turns into a speculation about the meaning of history and the land.
Harrower has also written adaptations including: The Chrysalids (1999), adapted from John Wyndham's novel, for the National Theatre's Connections project; Six Characters Looking for an Author, a version of Pirandello's Six Characters in Search of an Author, first staged at the Young Vic in 2000; Chekhov's Ivanov (2002), performed at the National Theatre; and Buchner's Woyzeck, performed at the Edinburgh Lyceum in 2002.
This production won the LA Drama Critics Circle Award for Best Writing and Lead Performance by Sam Anderson.
In 2011, he wrote a new version of Gogol's classic text, The Government Inspector, produced at London's Young Vic Theatre, directed by Richard Jones and starring The Mighty Boosh's Julian Barratt and Smack the Pony's Doon Mackichan and Kyle Soller.