The Secret of Indigo Moon is the second book in The DoppleGanger Chronicles Series by G.P. Taylor. Sadie, Saskia, and Erik become entangled in another dangerous mystery. Erik finds a secret tunnel in their children's home one sleepless night and lands smack dab in the middle of a robbery plot.
This book had a different feel than the first but I enjoyed it all the same. Again, we find the children in very dangerous situations with threats of impending death and doom. This book was definitely a fun little mystery and seemed a little lighter than the previous book. I was able to read it in just a few hours so it is a nice fun little read.