Yes I read it last year, I thought it was really good, evoked the hazardous train journeys, on the tops of trains that migrants from central America undertake to get into the US, often fleeing from dangerous drug cartels, in the case of the main character and her young son, gang warfare and poverty. Many dying along the way and with no guarantees they won't be returned from wherever they came from.
Divided opinions. For me a page turner, lot of heart in the mouth moments.