After Cassandra Evans leaves Kenzie's party around midnight, she is hit by a drunk driver and killed on impact. Kenzie, Winnie, Saryn, and Acadia are left to deal with the aftermath the next day, a day they had all planned to spend with Cassie. Cassandra Is Dead, And We Could Have Stopped It explores the impact one life can really have, and how we all deal with grief and picking up our broken pieces.