Beneath the Nelson Mandela Boulevard flyover on Cape Town's foreshore lives a community of stowaways, young Tanzanian men from the slums of Dar es Salaam.

When journalist Sean Christie meets Adam Bashili, he comes to know the extraordinary world of Beachboys, a multi-port, fourth-generation subculture that lives to stow away and stows away to survive. But Sean starts to accompany the beachboys on trips around their everyday Cape Town, he becomes more than a casual observer, serving as sometime moneylender, driver, confidant and scribe, and eventually joining Adam on an unprecedented tour of Dar es Salaam's underworld and a reckless run down Africa's east coast.

Under Nelson Mandela Boulevard remaps both city and continent, introducing us to the places and people we so frequently overlook.