Number 9 Dream by David Mitchell

As Eiji Miyake's twentieth birthday nears, he sets out for the seething metropolis of Tokyo to find the father he has never met. There, he begins a thrilling, whirlwind journey where dreams, memories and reality collide then diverge as Eiji is caught up in a feverish succession of encounters by turn bizarre, hilarious and shockingly dangerous. But until Eiji has fallen in love and exorcised his childhood demons, the belonging he craves will remain, tantalizingly, just beyond his grasp...