Pre-order the pulse-racing new Jack Ryan thriller, TOM CLANCY DEFENSE PROTOCOL, now!
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FOR JACK RYAN, THE GREATEST THREAT LURKS BENEATH THE WAVES . . . AGAIN

When a Russian superweapon is let loose under the waves, it's up to President Jack Ryan to find a countermove in the latest entry in this #1 New York Times bestselling series.

US intelligence is reporting turmoil in the Russian navy. Their deadliest submarine, the Belgorod, has unexpectedly launched. Who authorised the departure? What mission is it on? And, most disturbing of all, what weapons do the giant doors on the sub's bow hide?

It's been four decades since a similar incident with the Soviet sub, Red October, ended happily, thanks to a young CIA analyst named Jack Ryan.

Now, President Jack Ryan finds himself with fleets of ships, squadrons of jets, and teams of SEALs at his command, but what he doesn't have is insight into the plans of the Belgorod's commander. It falls to a younger generation of Ryans to do the dangerous work that will reveal that information.

But there's always a price to be paid. When the final moments tick away, will Jack Ryan have to choose between the safety of his country and the safety of his child?
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Reader reviews for ACT OF DEFIANCE

'The author definitely knows his subject and well informed with the politics and command structure. The story is well constructed and leads to a good climax'

'Netflix and prime should be fighting over the movie rights for this great read'

'Very good read! A completely absorbing plot and as always the final outcome fits the bill'

'Thoroughly enjoyable'