Gnomon

Gnomon, which took Harkaway more than three years to complete, is set in a world of ubiquitous surveillance. Pitched as "a mind-bending Borgesian puzzle box of identity, meaning and reality in which the solution steps sideways as you approach it", it features: a detective who finds herself investigating the very society she believes in, urged on by a suspect who may be an assassin or an ally, hunting through the dreams of a torture victim in search of the key to something she does not yet understand; a banker who is pursued by a shark that swallows Fortune 500 companies; Saint Augustine’s jilted mistress who reshapes the world with miracles; a refugee grandfather turned games designer who must remember how to walk through walls or be burned alive by fascists; and a sociopath who falls backwards through time in order to commit a murder.