I Know You Started It (A Secrets and Lies Novel) by Daphne Benedis-Grab

There’s a fire in a school locker! Was it an accident? A prank gone wrong? Arson? Someone looking for revenge? Eva, Dani, Liam and Gabe are determined to figure out who started the fire, and why. And they each have their own reasons for wanting to be the first ones to figure out what really happened. The administration says they’re looking into it, but evidence is scarce. It will take four students who can tap into the rumours, gossip and hidden secrets of their school to uncover what really happened on the day of the fire. And if they don’t figure it out in time? Well, one of them could be accused of the crime. But all their potential leads turn out to be dead ends. It’s as if the arsonist is somehow tracking their every move ...