When Philippe sees the super Boom Max 500 in the hardware store window, it's love at first sight. He is convinced that he and his family absolutely need this famous smart robot vacuum cleaner. So it is with great excitement and pleasure that, a few days later, he opens his birthday present and discovers Arthur! Because, yes, the super robot vacuum cleaner will be called Arthur. The days go by and, although it's honeymoon bliss at first, Arthur's little flaws quickly take over and everyone starts to get a little exasperated at having to share their daily lives with the robot. That's when Philippe has the brilliant idea of giving it to his grandmother. Skeptical at first, she finds her own way of dealing with the beast!