The Promised Neverland - Vol. 3 Ch. 17 - The Secret Room and William Minerva - Part 2

[MangaDex]

 

[SpecialProjectY]

It's just too convenient, the symbols on the books with Morse Code don't have an order, just words that can be arranged however you like it.
There's also possibility that not all books go to one place so sending messages would be like reading a confetti in kaleidoscope...

Meanwhile Don and Gulda are making shit up through half truth from Emma, although the real story is insane to comprehend and they were doubting even trafficking.