Heidi is a stick insect, long and thin like the twig of a tree. It's her first day at Bug School, where she hopes to learn lots and make new friends. But no-one will talk to her...and no-one will play with her at lunch. No-one even notices her! Perhaps she's blending into the twigs a little too well? Luckily, Miss Orb comes up with a plan to help Heidi stand out.