Question: What is the first book in the prequel series to the four books referred to also as the Predator Cities Quartet by Philip Reeve?

Context paragraphs:
Fever Crumb: Fever Crumb is a young adult post-apocalyptic science fiction novel by Philip Reeve, published in 2009.  Sequels called "A Web of Air" (2010) and "Scrivener's Moon" (2011) follow.  The books of the Fever Crumb Series are prequels to the Mortal Engines Quartet series of novels by the same author.

A Web of Air: A Web of Air is a young adult post-apocalyptic science fiction novel by Philip Reeve.  The sequel to "Fever Crumb", it is the second book in the Mortal Engines Quartet prequel series.  It was published in April 2010.

Mortal Engines: Mortal Engines is the first of four novels in Philip Reeve's quartet of the same name.  The book focuses on a futuristic, steampunk version of London, now a giant machine striving to survive on a world running out of resources.  The book has won a Nestlé Smarties Book Prize and was shortlisted for the 2002 Whitbread Award.

Larklight: Larklight, or the Revenge of the White Spiders!  or to Saturn's Rings and Back!  is a young adult novel by author Philip Reeve.  Illustrated by David Wyatt, it is the first book in the Larklight Trilogy.

Mortal Engines Quartet: The Mortal Engines Quartet is a tetralogy consisting of four novels written by the British author Philip Reeve: "Mortal Engines" (2001), "Predator's Gold" (2003), "Infernal Devices" (2005), and "A Darkling Plain" (2006).  It has also been referred to as the Predator Cities Quartet or the Hungry City Chronicles, although the author has objected to those names.

Traction City (novella): Traction City is a novella by Philip Reeve and is a prequel to the Mortal Engines Quartet it was released as a flip book alongside Chris Priestlys' teachers tales of terror for World Book Day.

Buster Bayliss series: Buster Bayliss is a series of books written by British author Philip Reeve, intended for younger readers.  The main character of the series is Buster Bayliss.  In the stories, Buster must stop someone or something taking over the world.  The catchphrase which often appears on the cover of the books is "where's there's trouble, there's Buster Bayliss".  So far there are four books.

Infernal Devices (Philip Reeve novel): Infernal Devices is the third of four novels in Philip Reeve's children's series, the "Mortal Engines Quartet".

Fever Crumb Series: The Fever Crumb Series is the title of a series of novels written by British author, Philip Reeve, and is the prequel series to his critically acclaimed "Mortal Engines Quartet".  As of 2015 the series consists of three books: "Fever Crumb" (2009), "A Web of Air" (2010), and "Scrivener's Moon" (2011).  The books follow a young woman known as Fever Crumb, and her adventures set around the time of the creation of the first traction cities that become so prevalent in the Mortal Engines series.  Reeve stated in 2011 that he had always envisaged a quartet for the series, assuring readers of a fourth installment.

Predator's Gold: Predator's Gold is the second of four novels in Philip Reeve's series for young adults, the "Mortal Engines Quartet".

Supporting paragraphs: A Web of Air Mortal Engines Quartet
Answer: Fever Crumb