I really liked this! Even though we follow a child character who is understandably (but frustratingly) naive at times (who sees the entrance of an underground tunnel and their first thought is to explore it?? By yourself??), it tells an untold tale of how the Grand Mosque of Paris played a crucial role in helping Jews escape from the city during the Nazi invasion. 

A very warm family living in the mosque. I also like how they naturally weave in aspects of Muslim life/Islamic history throughout the book.