Notes

278 pages, illustrations
Summary: When Oleg and Emma invent a new classmate called Sebastian, they are amazed when he appears - very much real - in their secret den. Sebastian isn't like the rest of their classmates. He's never eaten pizza, he's not sure what goose bumps are, and he has a satchel that seems to hold an endless supply of hot ice cream. But as the trio begin their adventures, more impossible things keep happening, from a runaway goat appearing at school to a sighting of some snowwomen walking down the road. Things soon take a turn for the dangerous when the three friends are pursued by the mysterious Institute of Unreality, who want to capture and erase Sebastian, restoring order to the world.