Danny Wallace has friends. He has a wife and goes to brunch, and his new house has a couch with throw pillows. But as he nears 30, he can't help wondering about his best childhood friends, whose names he finds in a long-forgotten address book. Where are they now-and where, really, is he?

Acting on an impulse we've all had at least once, he travels from London to Berlin, Tokyo, Australia, and California, risking rejection and ridicule to show up on his old pals' doorsteps. Memories of his 1980s childhood-from Michael Jackson to Ghostbusters-overwhelm him as he meets former buddies who have blossomed into rappers and ninjas, time-traveling pioneers, mediocre restaurant managers, and even Fijian royalty.

Danny's attempt to re-befriend them all gives remarkable new resonance to the age-old mantra, "friends forever!"