Mark Grenside, Malta based thriller author

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.

Based in MaltaThriller fictionPaperback and Kindle

The Books

Explore the Marcus Riley thrillers

The Bastion by Mark Grenside, book two in the Marcus Riley series

Marcus Riley series · Book 2

The Bastion

Partly set in Malta

A 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
Sunset Circus by Mark Grenside, book three in the Marcus Riley series

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 Amazon

New 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.

Start with The Bastion

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
Inside Valletta's underground vaulted tunnels — stone pillars and arched chambers

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 Malta
Vintage cinema and film reel imagery

The 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

1

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.

2

Jim Henson & The Muppets

Joined Jim Henson and The Muppets, working inside one of the most creative forces in entertainment.

3

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

1

Fall Out

the opening Marcus Riley adventure; available in a revised edition

Fall Out by Mark Grenside, book one in the Marcus Riley series
2

The Bastion

a conspiracy that draws Marcus and Mako to Malta

The Bastion by Mark Grenside, book two in the Marcus Riley series
3

Sunset Circus

a mystery involving a Nevada crime family and buried history

Sunset Circus by Mark Grenside, book three in the Marcus Riley series

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 Bookshop

Common Questions

Frequently Asked Questions

Mark Grenside is a London born, Malta based thriller author and former film and television producer, known for the Marcus Riley series.
The Bastion is partly set in Malta, with around a third of the novel taking place on the islands, including scenes involving Valletta's underground tunnels.
The first three books are Fall Out, The Bastion and Sunset Circus.
Use the Amazon links on this page for the paperback listings and available editions. In Malta and Gozo, ask Agenda Bookshops about current availability.
Further Marcus Riley books are planned. Add confirmed release details when they become available.

Choose your next thriller

Explore The Bastion and Sunset Circus by Malta-based author Mark Grenside.

Last updated: 29 September 2026