What if your child's imaginary friend wasn't... imaginary? Imaginary friends. Everyone's had them; they're harmless products of adolescence. But what if your child's imaginary friend wasn't... imaginary? Worrywart father Tom Boyer has just found the perfect home for his family: a bigger house in a better neighborhood, with woods in the back for his daughter Lilly to play in. But the move has been tough on Lilly; the street had no kids to play with...