Most of Green's works take place within the same fictional realm, encompassing multiple realities which characters inhabit, or in some cases move between.
The Deathstalker series is partly a parody of the usual space opera of the 1950s, told with sovereign disregard of the rules of probability, while being at the same time extremely bloodthirsty.
This series follows a team of three Ghostfinders: the leader, JC Chance, who was touched by something from Outside in a recent case and is still trying to determine what all that means; Melody Chambers, girl geek and computer expert; and "Happy" Jack Palmer, Class Eleven telepath and official gloomy bugger.
JC's motley crew is now considered an "A Team" at the Institute, and are slowly putting pieces together of a greater threat facing humanity.
Hawk and Fisher are a husband and wife team on the City Guard, an order which functions rather like a modern police force in a fantasy world of mixed Medieval, Renaissance, and Industrial Revolution stylings.
They live in the port city of Haven, a city-state so corrupt that they can justly make the claim of being the only guards who have never taken a bribe or looked the other direction.
A series of fantasy novels centering on the protagonist, John Taylor, and based in the "Nightside", a hidden area within London in which magic and advanced technology exist.
Indeed, Hawk and Fisher appear drinking at Strangefellows Pub in the Nightside as an unnamed but clearly recognizable couple in A Hard Day's Knight, and the Deathstalker series is often referenced: Haceldama, Hadenmen, and the Darkvoid Device are all mentioned in passing.