All it takes is one second. One stupid move. One click of a cell phone. When Callie discovers Katherine sprawled on the ground, she bends down to help her. It's only natural—the party's been a bit wild. And it's only natural for her to pull out the fake knife, irritated at one more example of Katherine's callous disregard of other people's feelings. But the knife is real . . . and bloody. And then Callie hears the click of one cell phone, followed by another, and another. In minutes, images of her holding the bloody knife have gone viral. Now wanted for murder, Callie is on the run from the police. All the evidence points to her guilt, but she's determined to prove her innocence, which means . . . the real killer is still out there.