Study Guide

Mortal Engines Chapter 21

By Philip Reeve

Chapter 21

In the Engineerium

  • The citizens of London are getting more and more antsy as Panzerstadt-Bayreuth approaches.
  • Meanwhile, Katherine sneaks into an Engineer's Guild meeting dressed up in a white lab coat and goggles.
  • Everyone's buzzing about MEDUSA. It's revealed to be "an experimental energy weapon" (21.27) that has been restored to working order. The plan is to have MEDUSA destroy the Shield-Wall.
  • Even more shocking to Katherine: her father is the one who found it.
  • In order to prove that MEDUSA works, the Lord Mayor has arranged a test. The dome of the cathedral starts to open...