London

Magnus Crome stands on the windswept roof of the Engineerium and watches the rising smoke.
An apprentice holds an umbrella over him, and behind her wait six tall, motionless figures dressed in black versions of the Guild’s rubber coats. The terrorists who breached the Engineerium last night have still not been caught, and security is being strengthened: from now on the Lord Mayor will go nowhere without his new bodyguard; the first batch of Dr Twix’s Stalkers.

Chapter 25: The Historians, Mortal Engines, pg 105/152

He sounds almost jolly. Beside him stand the geniuses who have made MEDUSA work again: Dr Chandra, Dr Chubb and Doctor Wismer Splay, along with Dr Twix, who simpers and bobs a curtsy, congratulating Valentine on his trip to Shan Guo. Behind her the black-clad guards stand still as statues, and Valentine nods at them. “I see you’ve been making good use of the old Stalker parts I brought you, Crome…”

“Indeed,” agrees the Lord Mayor with a chilly smile. “A whole new race of Resurrected Men.
They will be our servants and our soldiers in the new world that we are about to build. Some are in action even as we speak, down at the Museum.”

Chapter 33: Wine, and Nibbles, and the Dawn of a New Era, Mortal Engines, pg 124/152

In other niches lay treasures that her father had brought back from his expeditions; potsherds, fragments of computer keyboards and the rusting metal skulls of Stalkers, those strange, half-mechanical soldiers from a forgotten war. Their cracked glass eyes stared balefully at Katherine as she hurried by

23/152, Chapter 5: The Lord Mayor, Mortal Engines.