A few years after quitting his job to follow an ill-advised dream of becoming a guide on the Colorado River, Kevin Fedarko was approached by his friend, the National Geographic photographer Pete McBride, with a vision as bold as it was harebrained. Together, they would embark on an end-to-end traverse of the Grand Canyon, a journey that, McBride promised, would be “a walk in the park.” Against his better judgment, Fedarko agreed to the scheme. The ensuing ordeal, which lasted more than a year, revealed a place that was richer, and far more complex, than anything the two men had imagined.

In the mid-18th century, as new ideas—and a new unrest—begin to sweep the Continent, a young Jew of mysterious origins arrives in a village in Poland. Before long, he has changed not only his name but his persona; visited by what seem to be ecstatic experiences, Jacob Frank casts a charismatic spell that attracts an increasingly fervent following.

Retired policeman Tom Kettle is enjoying the quiet of his new home, a lean-to annexed to a white Victorian Castle in Dalkey overlooking the sea. For months he has barely seen a soul, but his peace is interrupted when two former colleagues turn up at his door to ask questions about a decades-old case. A traumatic case which Tom never quite came to terms with. His peace is further disturbed by a young mother and family who move in next door, a woman on the run from her own troubles. And what of Tom’s family, his wife June, and their two children?

In 1942, Lawrence Pritchard Waterhouse - mathematical genius and young Captain in the US Navy - is assigned to detachment 2702. It is an outfit so secret that only a handful of people know it exists, and some of those people have names like Churchill and Roosevelt. The mission of Watrehouse and Detachment 2702 - commanded by Marine Raider Bobby Shaftoe - is to keep the Nazis ignorant of the fact that Allied Intelligence has cracked the enemy's fabled Enigma code. In the present, Waterhouse's crypto-hacker grandson, Randy, is attempting to create a "data haven" in Southeast Asia....

In the ancient city of Nineveh, on the bank of the River Tigris, King Ashurbanipal of Mesopotamia, erudite but ruthless, built a great library that would crumble with the end of his reign. From its ruins, however, emerged a poem, the Epic of Gilgamesh, that would infuse the existence of two rivers and bind together three lives. In 1840 London, Arthur is born beside the stinking, sewage-filled River Thames. With an abusive, alcoholic father and a mentally ill mother, Arthur’s only chance of escaping destitution is his brilliant memory.