Swarm by Jennifer D. Lyle

 Shur is in her high school class when she notices an abnormally large butterfly. Her classmates also take notice and soon their phones are buzzing with emergency alerts. They've been told to take cover. Shur her two brothers and their two friends
make their way to Shur's home to shelter in place. 

They have seen the creatures attack and know that being outside could mean death. Shur organizes food, candlelights and necessities to make sure they have supplies to last as long as possible. The butterflies start to multiple making them all that more dangerous but it's not the only danger the group has to look out for. 

Shur has anxiety and as someone who suffers from anxiety, Lyle nailed what it's like to be a person with anxiety. The concept is unique and  but I wish it had been explored in more depth. Swarm is a little on the young side and would be perfect for middle school readers who enjoy sci-fi.