I read lately :

Game of Creation by Viola Sachs. Riveting study of Melville's ciphered language in Moby Dick. Puns, gematria, magic squares. . . the book is an eccentric combination of amazingly acute deciphering & intuitive thinking, with a pretty simplistic, reductive set of conclusions. Maybe faced with the labyrinth of Moby, one is tempted to resolve its meaning(s) too quickly. But I love this book. I would buy a copy, but it's very hard to find.

I've read it before. There's a lot of Melville in Stubborn Grew et al.