Jump to ratings and reviews
Rate this book
Rate this book
The British nuclear submarine HMS Proteus carries the most sophisticated anti-detection equipment in the world, codenamed "Leopard". Her first mission is to chart the new Soviet underwater defence system which poses the most deadly threat to NATO's northern flank.
But Proteus picks up a distress signal from a Soviet submarine lying crippled on the sea floor. And as she sets out on her rescue mission, the Russians prepare to spring a devastating deathtrap twenty fathoms beneath the ocean. The plan: kidnap the Sea Leopard!

370 pages, Paperback

First published January 1, 1981

18 people are currently reading
152 people want to read

About the author

Craig Thomas

87 books92 followers
David Craig Owen Thomas was a Welsh author of thrillers, most notably the Mitchell Gant series.

The son of the Western Mail rugby union writer, JBG Thomas, Craig was educated at Cardiff High School. He graduated from University College, Cardiff in 1967, obtaining his M.A. after completing a thesis on Thomas Hardy. Thomas became an English Teacher, working in various grammar schools in the West Midlands, and was Head of English at the Shire Oak School, Walsall Wood.

After unsuccessfully trying script writing for radio, Thomas wrote part-time, with his wife as editor, in two fields: philosophical thoughts in books of essays; and techno-thriller genre, which although invention is often attributed to the better-known Tom Clancy, many feel that Thomas was its true originator. Most of Thomas's novels are set within MI.6 and feature the characters of Sir Kenneth Aubrey and Patrick Hyde.

His best-known novel which brought him to global prominence, Firefox became a successful Hollywood film, both directed by and starring Clint Eastwood. After writing his third novel, 1960s Cold War espionage thriller Wolfsbane, he left teaching altogether in 1977. His later books include Snow Falcon and A Different War. Shortly before his death he finished a two-volume commentary on German philosopher Friedrich Nietzsche.

Thomas and his wife Jill had lived near Lichfield, Staffordshire, but moved to Somerset in 2010. He died on April 4, 2011 from pneumonia, following a short battle with acute myeloid leukemia. He was 68.

Ratings & Reviews

What do you think?
Rate this book

Friends & Following

Create a free account to discover what your friends think of this book!

Community Reviews

5 stars
84 (24%)
4 stars
107 (31%)
3 stars
130 (38%)
2 stars
13 (3%)
1 star
5 (1%)
Displaying 1 - 11 of 11 reviews
Author 3 books5 followers
October 9, 2023
It is great to see these classic technothrillers re-released on Kindle, even if it is a bit frustrating they are often priced as though they are new releases. With that said, this is an excellent read, introducing Kenneth Aubrey of MI6. The British have developed a new stealth submarine, the Americans are eager customers and the Soviets desperate to get their hands on the technology.
Learning of a risky mission to test the Sea Leopard technology aboard the nuclear submarine, Proteus, the Soviets put together an elaborate plot to capture the vessel and learn it’s secrets. At the same time, London based, KGB agent Petrunin is trying to capture Quin, the inventor of the technology. Aubrey must juggle the situation in the North Sea and the KGB actions in England, with his man Hyde on the case, but alone against an increasing cast of Soviet agents.
Profile Image for Edwin.
1,078 reviews33 followers
November 2, 2023
Een vlot geschreven thriller, waarin het nodige onderzoek is gedaan door de auteur. De onderzeese belevenissen zijn zeer realistisch beschreven.

De Proteus is een nucleair aangedreven onderzeeër die is uitgerust met een nieuw ontwikkeld systeem om zo goed als onzichtbaar te zijn op sonar en andere systemen. De uitvinder van het systeem is echter spoorloos verdwenen en de Britse geheime dienst vermoedt dat hij in handen is gevallen van de KGB.

In een van de verhaallijnen wordt getracht zijn dochter te vinden vóór de KGB dat doet. Dan is er het verhaallijn waarin de Proteus in handen is gevallen van de Russen.
Profile Image for Neil.
1,319 reviews16 followers
July 7, 2025
Pretty good despite being over forty years old. I had read this first in the late 80s or early 90s after reading the Firefox "trilogy" (and when I was "on a kick" reading submarine-oriented stories [that, and the cover of the paperback I read was pretty awesome at the time with the submarine's conning tower half-in, half-out of the water]). Overall, it's a fun story, and I can see why Craig Thomas could be said to be the "creator of the technothriller" and that Tom Clancy merely "perfected it." The character development was decent - the author initially gave us what we needed to know about the different characters in the story but then gave hints about some of their backstories as the narrative progressed.

I momentarily found myself wondering if Clancy was influenced by this book .

The plot is pretty ballsy.

There was one major weakness in the plot, I felt.

This was a fairly fast read for me. I read it mostly over my lunchbreak at work but brought it home to finish over the weekend. It was good - it held my interest from start-to-finish, but I can see why I generally enjoyed Clancy's work more than Craig Thomas's stories - something about Clancy's writing style makes them more ... relatable or enjoyable or something. At the same time, it was fun to read this book because of all of the "British jargon" and slang in it that I am not familiar with (and which the Russians seemed to use at times as well, especially the latter part of the book after the Proteus has been captured). Enough time had passed that I did not remember how the situation was resolved, so I was (almost) on the edge of my seat a few times as the end drew near. It was a pretty "bare bones book", 316 pages in length, which was just fine as the relatively low page count helped keep the story focused and on-point (not like how Clive Cussler's books got pretty bloated in terms of story and page-count as his Dirk Pitt stories became more popular). Even though it is a bit dated because of the time period in which it is set (the Cold War in the early 1980s), I think it still stands the test of time in terms of being entertaining, and it was fun to revisit it. I could see myself reading it a third time, but just not anytime soon, hahahah! Solid three stars for me.
6 reviews
November 29, 2012
The research that went into this novel is obvious. A fast-paced thriller, the submarine scenes are thoroughly believable and leaves the reader breathless and wanting more. It certainly kept me on the edge of my seat. A great novel to add to your collection by Craig Thomas.
3 reviews
September 14, 2020
If you like the movie firefox which stars Clint Eastwood then you will definitely like Sea Leopard. If you want suspense, than this is the book for you. It keeps you guessing until the very last chapter. It is indeed a good read. But that's just my opinion!
Profile Image for Simon Turner.
5 reviews
December 3, 2012
read this book for the third time now, and i still find it as riveting as the first time. a great plot and tension to match any thriller
Profile Image for Nik Morton.
Author 69 books41 followers
April 1, 2023
Craig Thomas is on top form with his seventh novel, the thriller Sea Leopard published in 1981.

This adventure again features Kenneth Aubrey, Deputy Director of British Intelligence, and Patrick Hyde, one of his field agents.

The book begins with a map of the North Sea, UK, Scandinavia and Russia and the Barents Sea. This is followed by documents from Plessey, the weapons manufacturer, the SIS, Ministry of Defence and the US Navy Defence Department, all relating to the installation of a new anti-sonar system for submarines, ‘Leopard’.

The nuclear submarine HMS Proteus has the system installed and is running trials at sea when a distress call is detected.

At about this time a search was underway for Leopard’s inventor, Quinn, who has gone missing. Hyde is attempting to track down Quinn. Soviet agents are attempting to abduct Quinn’s daughter, Tricia, in the hope that she will lead them to Quinn’s whereabouts.

The distress call is a trap and the captain of Proteus, Commander Lloyd falls for it.

The tension mounts as a number of Soviet surface ships and submarines play cat-and-mouse with the Proteus – for their sonar is incapable of detecting the British submarine, thanks to ‘Leopard’.

Ingenious methods are deployed by Russian Valery Ardenyev, office in charge of the Soviet Underwater Special Ops Unit to incapacitate the submarine and take the crew captive and then learn everything about the Leopard system.

A rescue mission is then mounted by Aubrey, using USN special agent Ethan Clark.

The suspense mounts, switching from Hyde’s search in England, Ardenyev’s bold assault in inclement weather, Aubrey’s altercations with Ministers and the Navy’s hierarchy, Commander Lloyd’s concern for the safety of his vessel and crew, and Clark’s near-impossible mission on the edge of the Arctic Circle.

A gripping thriller that time has not spoiled in the slightest.
321 reviews2 followers
November 22, 2019
More classic Cold War shenanigans from the dependable Craig Thomas. "Leopard" is a top secret Royal Navy cloaking device whose prototype is being trialled by the sub "Proteus". Rather ambitiously, she's sent to the Barents Sea to map a new Soviet sonar array. Meanwhile, back in Britain "Leopard" 's scientist inventor and his daughter go missing - nabbed by the Russians? Spymaster Kenneth Aubrey from the author's four previous thrillers is in charge of putting things right.

This marks the first appearance of Patrick Hyde, the Australian (strewth, is he Australian) SIS agent who goes on to become Aubrey's regular action man sidekick in the series - Bond to Aubrey's M. The action switches between the plight of the "Proteus" and events back in Blighty as Hyde tracks down the missing scientist Quin (a bit of a drip, ditto his daughter) while fending off KGB spies. The twin track approach works fairly well with both plots just about staying on the credible side.

The prose is a bit clunky and Aubrey is given to melodramatic commentary. I found it dragged a bit early on but built to a thrilling finale. Despite the Soviets clearly being the baddies - fair enough - there's still room for a sympathetic Russian frogman, Andreyey. There's a pleasing lack of faffing about (ie. romance, internal dialogue and political nuance) and not an ounce of fat on the ending. The combination of spycraft and military action set this author apart, a template similar to Tom Clancy's subsequent work - there's even an American called Clark who performs commando heroics in Soviet territory. "Jade Tiger" next up when I've recovered my breath.
Profile Image for Geoff Boxell.
Author 9 books11 followers
November 27, 2016
Fast moving, interesting details, but a few plot holes. which hasn't stopped me reading it twice (after a few years between reads).
161 reviews
March 30, 2020
Very much, of its time. Better than one star, not really up to two.
Displaying 1 - 11 of 11 reviews

Can't find what you're looking for?

Get help and learn more about the design.