All the good and exciting bits of Qin Ling Shen Shu are in this volume! The delicious horror of the reveal about Lao Yang, the fact that the tree essentially pits them against their own imaginations (and intrusive thoughts). They really sectioned the books off weirdly for the collector's edition: the third volume is dry, while the fourth is bursting with twists and action, and finally progresses the series-long arc connecting the various tombs.
Hitting my stride, hoping that the good streak continues!