Olivia's best friend is not imaginary. He’s not a ghost, either. And she's pretty sure he's not a hallucination. He’s just Mason. He is, however, invisible. When Olivia spotted the crying little boy on her front porch at five years old, she had no idea she was the only one who could see him. Twelve years later when new-girl Robin bumps into the both of them and introduces herself to Mason, they are both stunned. Mason couldn't be more pleased that someone else can see him. Olivia, on the other hand, isn't jumping at the chance to welcome Robin into their circle. Jealousy may have something to do with that, but honest fear that Robin's presence will put Mason in danger is soon validated when a strange black car begins showing up everywhere. The race to find out what Robin knows in time to protect Mason from whatever threats are coming becomes Olivia's only focus.

Kathryn just moved from her home in New York, New York, to a cottage in Middle-of-Nowhere, Alberta, Canada. At first, she is as lonely as ever, and on her first day of school, she just wants to keep a low-profile. But a few people won't let that happen. Kathryn not only makes a few friends, and develops a huge crush on one of them, but they become friends for life. What happens when one of them is in a car accident and their father threatens to take them back to where they were born; England? And what will happen to Kathryn if they do move back? Will she make new friends, but not necessarily ones that will urge her to make good decisions, or will she become invisible from everyone around her?