Photos: suppliedQueenstown author Peta Carey has one piece of advice for anyone sitting down to read her fourth book, The Hollows Boys. Ms Carey’s late partner, Dave Comer, knew the Hollows boys well, particularly Kim, while Ms Carey has known them for about 40 years. But birthing the book had been a particularly tough process for Kim and Mark. One of the themes that intrigued her while writing the book was the widespread PTSD left in the wake of the 25-year helicopter venison industry, and its legacy of grief, trauma and sometimes guilt. Then there was the "elephant in the room" conversation about the conservation implications without helicopter venison recovery, noting Fiordland now had a deer population bordering on what it was in the 1960s.