Not sure if this is supposed to work this way but let me give you the two scenarios. Both assume book of thay and amethyst is found and assembled.
1) put the book away , no delving into the secrets. Gale accepts it and ingests it.
2) read the book until you cant read it anymore(aka the book slams shut). Cant give the book to gale then.(BTW, if you go back then and try to open the book, it says you cant)
With two , my warlock did not get any new spells, wasnt hitting any harder than normal.
Is this correct or should i bug this? Not sure what to make of this book.
Thanks in advance