She just wanted a paycheck.Not her best friend's life. Not her best friend's man.Mara needed the job. Rent was due, and Elise's boss offered her the temp gig without blinking — same building, same desk, same badge.Easy money. Until he looked up from across the office.Elise's boyfriend. Golden smile. Eyes that lingered a second too long."You're doing great, Elise," the messages say."Don't stop now, Elise."Except Mara never told anyone her name was Elise.And Elise never told anyone she was leaving.Now Mara's wearing another woman's name. Falling for another woman's man. Feeling his hand brush hers like it's the most natural thing in the world —while somewhere, Elise is screaming into silence.Somebody made her disappear.And somebody just fell in love with the girl who took her place.THE SUBSTITUTESome hearts you can't quit.