Sue starts her journey at the western end of the border, in the Mexican city of Tijuana, where she tries just about every sample in a Tequila showroom and is left in no doubt that the city deserves its reputation as a party town. She also discovers an unexpected invasion of migrants: American retirees who have settled south of the border to enjoy the good life and an ocean view at an affordable price...

Sue visits the Mexican city of Juarez, essentially one half of a super-city adjoining El Paso, Texas. Here she meets people whose lives traverse the border, including Gabriela, who is bringing up her kids alone in El Paso because her husband, Adrian, is not legal in America and is stuck in Juarez. Every weekend she takes the children to the border, so they can cross into Mexico and be with their dad. But Gabriela is not allowed to cross the border until her own immigration papers are finalised, and in the last six years she and Adrian have spent only 15 minutes together...