The Dr Fung Diabetes book is excellent. It is a organized distillation of his blog posts, which are extensive! Opposite of some authors, he has more information on his website, so it is easier to find indexed information in the book.
There is a thread on the General LC forum with lists of other books members have suggested, ones to consider before Dr Kruse. https://forum.lowcarber.org/showthread.php?t=480468
A book published in 2011, I still recommend as the best well written introduction to history of LC, and using diet for diabetes and obesity, is Why We Get Fat . This and the 2010 New Atkins (which has the most science of the Atkins books) are quicker reads, often found libraries, thrift stores, on Amazon used, etc.