I sure do love short stories. This collection caught me by surprise...out of the 10 chapter-length stories here, more than half deal with some really heavy topics: migrant children in detention centers in Texas, migrant families crossing the Mediterranean, a neo-Nazi father trying to indoctrinate his son, child labor involved in mining crystals, migrants in a Libyan detention center, possible slave labor in a nail salon. A few of the stories made me cry, and many had me Googling topics. The other stories that weren't quite so heavy were still powerful. A couple stories had magical elements, which was also surprising.
The main characters are not connected in any way, but all of them just turned 11, and they are all faced with choices about what kind of person they want to be. Some of these choices are really subtle. For example, after being released from his detention center and reunited with his mom, the boy chooses to say "Thank you" to the detention worker as he is leaving...he thinks about NOT saying it, but decides that he still wants to be the person who does the polite thing, despite everything he has been through.
Spoiler-not-spoiler: Because this is a young adult book, none of our newly-turned-11 characters die (despite some of their truly awful circumstances), and they all make good choices. For this reason, I think this would be a perfect book to use in pieces for different classroom topics...you could easily just have a class read one of the stories before having a discussion about migration, for example. It would also be great for a school book club.