The past is coming back to haunt the Hero Squad. Archimedes, the Squad's first foe, is finally heading to trial, and the teen heroes aren't exactly looking forward to again facing the man capable of revealing their deepest secrets to the world - but their secrets are nothing compared to the dark truths being hidden from them by people they know and trust. When those secrets are finally laid bare, they could tear the team apart, one heartbreaking piece at a time...and if they don't, the bloodthirsty killer known as Buzzkill Joy will.