The Virtue of Remaining Steadfast when Losing a Child (fadl al-Jalad 'inda faqd al-Walad)

It's really beautifully written. Absolutely thoroughly documented. The footnotes are very scientific and verifiable. I also like that it gives a lot of information not only naturally on the many Hadiths on the topic, but also on many additional books one could read. I find it also very helpful and thoughtful that it mentions the availability of helplines and in which situations one should possibly try to get also professional help apart from the book.