David is a well known writer of comic fiction . His Thorfinn the Nicest Viking was shortlisted for the Lollies

'Two galactic rulers, Cassiopeia and Perseus, have battled across the stars. Now their feud lands in Bilgeley, a nowhere town, on nowhere planet Earth.
Princess Cassiopeia's in a fix. She shrank her entire space armada while making a smoothie (don't ask!). She came to rally Earth's leaders. She got Hillman. Age eleven. And his crusty old Grandad. Perseus isn't far behind, and when his armada shows up, Earth's toast.
Perseus, Lord of the Seven Spirals, Admiral of the First attack Fleet , Commander of the Order of Zarg, Winner of the Alpha Centauri Award for Best Dressed Galactic despot is not amused by the situation. And he's landed in Bingeley dump. Roz, age eleven, is here to help but she's got her eyes set on a bank heist. What does such a small girl want with so much money and how has she got the nerve to turn down his offer of the order of the Medusa and a far flung galaxi? Perseus is about to fin out!

Can Hillman save the Earth? Maybe...