The Big Crush by David J. Schow
Every computer in the world should have a button marked Take It Back. A convenient time-travel option that permits the withdrawal of bad choices, or the elimination of the wrong keystroke for the fumble-fingered. Take It Back. Be careful what you wish for.
“In the words of a giddy preteen: I can’t even. THE BIG CRUSH is smart, violent, inventive and so goddamn L.A. it hurts. Ladies and gentlemen, David J. Schow has written his magnum opus — with emphasis on the “magnum” part. Hands down, my favorite thriller in years.” —Duane Swierczynski, Edgar-nominated author of CANARY