“I’ll destroy… the plan mom has in mind.”
The Promised Neverland features an overarching story with a terrible, previously revealed underlying secret. Best to start reading with volume 1.

Mom’s not playing around anymore, and the big cliffhanger from last volume has major consequences as the core group of children are faced with decisions and threats they don’t agree on how to deal with.
There’s a lot in this volume that’s been built to since the beginning, with the start of payoffs to long running threads and a number of big twists. Incredible use of flashbacks gives new meaning to old scenes, and the all out battle of wits between the children and mom has real consequences. This volume is simply fantastic, and ends with another intriguing cliffhanger as the first major arc of the manga seems to be reaching its climax.