What would you do if you had an invisible best friend? Sammy Jacobs loves all things spooky, like ghosts and science fiction. His parents are serious scientists, so they don't believe in anything that isn't 'real' science. But Sammy is about to discover something totally unreal living right in his own house! Imagine waking up to find someone you can't see is hanging out in your room. Or even worse, eating your breakfast cereal! That's exactly what happens to Sammy when a mysterious, invisible friend decides to move in. It might sound cool at first, but having an unseen roommate can cause all sorts of strange and creepy problems. Can Sammy convince his science-minded parents about his invisible guest? More importantly, can he figure out a way to get rid of this invisible pal before things get too out of control? Dive into this exciting Goosebumps adventure and find out if Sammy can make his invisible problem disappear!