Why Are We Having a Lockdown Drill?

This book gently explains to children why having a lockdown drill is necessary. Since each school has its own rules and procedures for a lockdown drill, this book doesn't go in to procedures, but only mentions the importance of the students being superhero listeners and being still and silent. I tried to present the importance of having a lockdown drill in a positive way, so students will understand that it is another way to keep them safe.