A beautiful and moving picture book from Waterstones Children's Laureate, Joseph Coelho, tells the story of how a big, hairy argument gets in between two best friends. 'The argument came from nowhere. It sat huge and bloated in the middle of the playground between me and my best friend.' This big hairy monster appears out of the blue one day, splitting up the best friends and growing bigger and bigger, until it starts to ruin all the children in the playground's fun. Together, they learn how to shrink the monster until it vanishes completely, to the point where they can't even remember what it looks like! Coelho's gentle and lyrical verse pair perfectly with Allison Colpoys' beautiful illustrations to create a book which will be treasured by young readers. This is an ode to the power of an apology, and to treasuring a special bond that runs deeper than even the friends realised.