Invisible Friends tackles the ever important issue of stranger danger on the internet. During a playdate, Winnie finds her friend Yuna online talking to strangers. While Yuna thinks it is okay because her older sisters do it, Winnie explains that it is not safe to talk to people online who you don't know (and definitely not share personal information). This it the first book in the "Stories from Cloud Canyon" series. For more about the development of this series, visit www.buildyourowncastle.com