After living on California's streets for a decade, Greg and Marie received a remarkable invitation.

A local businessman asked if they wanted to share his $4m home.

A year later, we reveal what happened next - and what the experiment tells us about America's homelessness crisis.

Video produced by Hannah Long-Higgins, Chelsea Bailey and Cody Godwin; edited by Hannah Long-Higgins.

This film is part of the BBC's Crossing Divides season and also a collaboration with the San Francisco Chronicle. Read Otis Taylor Jr's column on Greg and Marie.