it's 100% either may-giss [ˈmeɪɡəs] or (latin) may-goos [ˈmäɡʊs̠], hard g. I mean look, if people understand, they understand. To-may-to tom-ah-to and all.
I loved the book! ... But I took one star away because the last two or three chapters just felt rushed (I would have liked to read more from the grandma) and although the heroine was always praised for her cleverness, there were times she couldn't connect two very obvious dots which highly annoyed me
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