
Mark Grenside
Malta based author of the Marcus Riley thrillers
From Hollywood film sets to the tunnels beneath Valletta, Mark Grenside's thrillers follow dangerous secrets across the world. Based in Malta, the former film and television producer brings his experience of the entertainment industry to the adventures of Marcus Riley and Melinda "Mako" de Turris.
The Books
Explore the Marcus Riley thrillers

Marcus Riley series · Book 2
The Bastion
Partly set in MaltaA stolen list of the world's most heavily insured people is concealed inside a Hollywood film, drawing producer Marcus Riley and his partner Mako into a conspiracy of kidnapping and betrayal. Their search leads to Malta and the underground tunnels of Valletta, where the secrets hidden behind The Bastion could put lives at risk.
Around a third of the novel is set in Malta, bringing the islands' history and hidden spaces into an international thriller.
Paperback and Kindle
Buy The Bastion on Amazon
Marcus Riley series · Book 3
Sunset Circus
A cryptic riddle and the death of an old friend draw Marcus and Mako into the world of a Nevada crime family. Another Marcus Riley adventure moving from history 100 years ago into a modern day world of crime and dangerous loyalties.
Another Marcus Riley adventure, moving from Los Angeles into a world of crime, hidden history and dangerous loyalties.
Paperback and Kindle
Buy Sunset Circus on AmazonNew to the series?
The Bastion is the recommended starting point — it's the Marcus Riley thriller set partly in Malta, and you can read it before or after Fall Out.
The Malta Connection
Malta in The Bastion
For readers who know Malta, The Bastion offers the pleasure of encountering familiar surroundings inside a fictional conspiracy. Valletta's underground tunnels play an important role, while the story also travels beyond the islands.
Mark drew on local knowledge while researching the book, including help from Marc Zimmerman and Daniel Cilia on underground Valletta. The result brings his interest in Malta's history together with the film industry setting that runs through the series.
Malta has long attracted filmmakers from Gladiator and Troy to Game of Thrones and that cinematic history gives The Bastion an authentic backdrop for a thriller built around the movie business. The islands' layered past, from the Knights of St John to the Second World War, provides the kind of hidden history that conspiracy fiction thrives on.
For visitors inspired to explore, the capital's fortified walls, secret passages and harbour views are all within walking distance. MaltaGuide's Valletta guide covers the key sights, from St John's Co Cathedral to the Upper Barrakka Gardens.
Explore Valletta with MaltaGuide
Malta research details supplied in the author's press release.
Real Places
Locations from The Bastion
Valletta's underground tunnels
The Bastion draws on Valletta's hidden network of tunnels and underground spaces, researched with help from local experts.
Explore Valletta
Malta's filming legacy
Malta has long attracted filmmakers — from Gladiator and Troy to Game of Thrones — giving The Bastion an authentic cinematic backdrop.
Films shot in MaltaThe Author
About Mark Grenside
Born and raised in London and now based in Malta, Mark Grenside began his career at Lloyd's of London, specialising in kidnap, ransom and extortion insurance. He later joined Jim Henson and The Muppets before working across film and television production.
Those experiences inform his thrillers, which combine fictional conspiracies, historical threads and an insider's understanding of filmmaking. His recurring leads are movie producer Marcus Riley and designer Melinda "Mako" de Turris.
The Bastion and Sunset Circus follow Fall Out, the novel that introduced the pair. Further books in the series are planned.
The Writing
The career behind the thrillers
Lloyd's of London
Began his career at Lloyd's, specialising in kidnap, ransom and extortion insurance — a world that informs the conspiracies at the heart of his thrillers.
Jim Henson & The Muppets
Joined Jim Henson and The Muppets, working inside one of the most creative forces in entertainment.
Film & Television
Built a career across film and television production, bringing an insider's understanding of the industry to the Marcus Riley series.
The Series
Discover the Marcus Riley series
Fall Out
the opening Marcus Riley adventure; available in a revised edition

The Bastion
a conspiracy that draws Marcus and Mako to Malta

Sunset Circus
a mystery involving a Nevada crime family and buried history

More Marcus Riley adventures are planned.
In Person
Find the books in Malta
Prefer to browse in person? Ask at Agenda Bookshops in Malta and Gozo about Mark Grenside's books and current availability.
Visit Agenda BookshopCommon Questions
Frequently Asked Questions
Choose your next thriller
Explore The Bastion and Sunset Circus by Malta-based author Mark Grenside.
Last updated: 29 September 2026