King Liam is known for his king-sized meltdowns. So when he has a dream that his birthday party was going to be ruined, he takes drastic measures. The only problem is that he can't remember what was going to ruin the party, just that it started with the letter P! Everything must go! Obviously the party is postponed, but he also says goodbye to pepperoni pizza, piñatas, pants (long, short, old, new, smarty, fancy), parrots; even the royal goat, Percival (after he's eaten all of the abandoned pants), and more.

But... when he sends away all of the people, he finds himself positively alone. On his birthday. Will King Liam ever discover what that pesky and problematic P is?

Brittany Pomales's gift for humor and heart shines in this book that children and adults alike will relate to. Illustrated by the New York Times bestselling illustrator of Dr. Seuss's Horse Museum, Andrew Joyner, It Started with a P will delight and entertain readers of all ages.