Olivia loves her favorite sweater. I mean, she really really loves it. So when her mom decides it's time to hand it down to Olivia's baby brother, Olivia vows that she will not rest until she and her beloved sweater are reunited.

In her riotously funny new picture book, Kevin the Unicorn creator Jessika von Innerebner puts an oh-so-satisfying spin on an age-old conflict that is bound to delight siblings of all stripes.