Annabel Crabb - "Stop at Nothing: The Life and Adventures of Malcolm Turnbull" (Quarterly Essay issue 34)

This made for a fast-paced and interesting read (Crabb's background as a journalist serves her well) - it reads as a pretty balanced account, and everything in it was entirely plausible and consistent with my existing image of Turnbull. (Got through it in a couple of hours, spread over a few sittings - it makes for perfect public transport reading.)