Quoted from the PleasantcoPublishing site-
"This slimline display boldly announces our new book series for older readers?American Girl Mysteries?, in addition to Mystery Party Games for Kit, Samantha, and Molly, plus the new four-in-one American Girl Mystery Puzzles."

Sure sounds like there's going to be more, if it's a "New series."

I have hopes there will be books made for the additional 4 dolls- Felicity, Josefina, Kirsten, and Addy. The first 4 mysteries were all quite good.