With Felicity Packard and Greg Haddrick, Peter Gawler wrote for the television drama Underbelly (2008) based on the true crime book Leadbelly: Inside Australia's Underworld Wars (2004) by John Silvester and Andrew Rule. In 2010, Gawler was shortlisted for the Queensland Premier's Literary Awards in the Television Script category for A Model Daughter: The Killing of Caroline Byrne. Gawler began working for Crawfords in 1976.
Underbelly: Badness chronicles the spider web of criminality spun by Anthony Perish and the quest by a dedicated team of police to bring him and his associates to justice. A feared underworld figure, Perish managed to maintain an almost non-existent public profile, which was only revealed when his connection to the murder of Terry Falconer, a former inmate of Sydney's Silverwater jail, brought him to the attention of Strike Force Tuno, which was formed to find Falconer's killers. Displaying an extraordinary level of perseverance and determination, Strike Force Tuno, led by Detective Inspector Jubelin spent ten years gathering the evidence that would finally see Perish brought to justice.'
'In 1998 two masked bandits undertook a series of hits on Asian restaurants in Melbourne, leaving a dire message for victims to give police: "Tell them Lucifer was here." A police sting known as Operation Hamada was set up to get them. But in the middle of a stakeout, two policemen Gary Silk and Rod Miller were killed in cold-blood on a lonely street in Moorabbin.'