I don't know how to judge this book. I'm kinda confused. I really liked the first part and the main protagonist. I thought I was reading a solid 4* story, but then the plot became tedious, the middle section was too long and forgivable and I really thought I was near the ending while actually I was only at 60%. The last section was ok though, so I think overall it deserves 3*. The setting was cool but not very well explained, I liked all the references to the ancient times and all the artifacts that the Bellamys collected but the Sunken City remains a missed opportunity in my opinion. I'm glad it's a standalone because I wouldn't have read a sequel.