大家都可以拿到氣球當作畢業禮物，但是只有長滿尖刺的刺蝟不行，ISABEL會想出甚麼法子來獲得氣球呢?
Balloons are bright and floaty and shiny and perfect.
More than anything else in the whole wide world, Isabel wants a balloon. Everyone will get one on Graduation Day—everyone except the porcupines, because Porcupines + Balloons = Trouble
But Isabel isn't going to settle for another boring bookmark. She has a plan. . . .
