Jennifer Bauer 
Aubrey, Evan and the School Safety Drill [EPUB ebook] 

Aubrey and Evan are excited to start a new school year but become worried when they learn their class will soon start practicing lockdown drills. They’ve never done them before and don’t know what to expect.
Aubrey, Evan and the School Safety Drill is a book that gently introduces kids to the Code Red drill. It explains what happens and why it’s necessary to do them.
It’s the perfect book for any child who is starting school or for a child who may be struggling with the idea of safety drills.