The Mortal Engines Quartet, also known as the Predator Cities Quartet, is a series of epic young adult science fiction novels by the English novelist and illustrator Philip Reeve. He began the first volume of the series, Mortal Engines, in the 1980s, and it was published in 2001. Reeve then published three further novels, Predator's Gold (2003), Infernal Devices (2005), and A Darkling Plain (2006).