Ace of spades

"When two Niveus Private Academy students, Devon Richards and Chiamaka Adebayo, are selected to be part of the elite school's senior class prefects, it looks like their year is off to an amazing start. After all, not only does it look great on college applications, but it officially puts each of them in the running for valedictorian, too. Shortly after the announcement is made, though, someone who goes by Aces begins using anonymous text messages to reveal secrets about the two of them that turn their lives upside down and threaten every aspect of their carefully planned futures. As Aces shows no sign of stopping, what seemed like a sick prank quickly turns into a dangerous game, with all the cards stacked against them. Can Devon and Chiamaka stop Aces before things become incredibly deadly?"--From the publisher's web site.