One Impregnable Prison. One Doomed Agent. One Desperate Idea.Alex, the captured MI6 agent, is in Russia's most secure and dangerous prison-forgotten, lost, desperate. For all he knows, he'll die there.Can MI6 find him or rescue him? But no-one has ever escaped from the Black Dolphin prison. He is an inmate who doesn't officially exist.And if the Russian President learns that Anissa and her colleagues have discovered Alex's whereabouts, will he die before he can be rescued?From the International Bestselling author of The Tablet, comes the penultimate instalment in his much loved Hunt series.