Rip tide

"When pirates attack a cargo ship off the Somalian coast and one of them is found to be a British-born Pakistani, alarm bells start ringing at London's Thames House. MI5 Intelligence Officer Liz Carlyle is brought in to establish how and why a young British Muslim could go missing from his well-to-do family in Birmingham and end up onboard a pirate skiff in the Indian Ocean, armed with a Kalashnik...