The Treasure Key, written by Shannon L. Brown, is the second in this series.
I received this series mainly for my 11 yr old daughter who really doesn't like to read. I've read an adult book written by this author and thought it was great. My daughter loved the first in the series and also has enjoyed this one. She said it was a great story of a lost treasure and loved the girls in the story. She's very close with her sister and felt that Sophie and Jessica reminded her of her relationship with her sister. No doubt I'll be hearing the story played out multiple this summer between the two as they always love a good mystery to act out. I loved that Brown was yet again very capable of keeping her attention while she got into this story. Totally recommend this read especially for those kiddos that might not like to read...it'll keep them pushing through just to see what happens!