“Do you think what they told us is the truth?”
The Promised Neverland features an overarching story with a terrible, previously revealed underlying secret. Best to start reading with volume 1.

Emma and her compatriots continue slowly building their escape plan, hampered at every turn by their “mother” and Sister Krone, who each have their own goals and agendas. There’s a real sense of moving forward while maximizing the slowly escalating tension. There’s significant time spent with “secondary” characters, and Krone’s maneuvering in particular becomes a main focus. As I’ve mentioned previously I’m extremely impressed with the way the characters are all extremely intelligent without being infallible, and the constant efforts of them all to outthink each other is one of the manga’s best points.
It all adds even more layers to everything that’s happening and begins to show real consequences for the choices being made, including various levels of palpable threat. The gradual world building and major gambits and moves in this volume heighten the impact of the unfolding mysteries and lead to a huge cliffhanger. Strong third volume with a ton of important developments and even more intriguing plot lines set up for the future.