London: British private investigator Glenn Mulcaire hacked the voicemails of Kylie Minogue's siblings, Dannii and Brendan, so News of the World could write intimate details about the pop star's cancer treatment in Melbourne in 2005.

Details of the hack were revealed in one of two new books published after the phone-hacking trial, both of which shed new light on the scandal that engulfed Fleet Street over the past half-decade.

Kylie Minogue's siblings were hacked for news about the pop-star's cancer treatment. Credit:Getty

Hack Attack, by Nick Davies of the Guardian, covers six years of his reportage and investigation.

And The News Machine, by the Independent's James Hanning, is co-written by Glenn Mulcaire, the News of the World's private investigator who was twice convicted for phone hacking, and whose notes and emails were vital evidence in convicting four senior News of the World editors on phone hacking charges.