Abandoned by their girlfriends for the summer, rich teenagers Tenoch and Julio meet older woman Luisa at a wedding. Trying to impress Luisa, the friends tell her they are headed on a road trip to a beautiful, secret beach called Boca del Cielo (Heaven's Mouth). Intrigued with their story and desperate to escape, Luisa asks if she can join them on their trip. Soon the three are headed out of Mexico City, making their way towards the fictional destination. Along the way Luisa seduces the two young men, and they begin to argue over her. As they continue their journey, caught up in their own world, the wealthy trio all but ignores the harsh realities of poverty that surround them.