Last week,Ms. McLaughlin, 28, and Ms. Kraus, 27, informed their literary agent, Molly Friedrich of the Aaron M. Priest Literary Agency, that they would be signing with William Morris agent Suzanne Gluck. The move comes less than two years after the pair, who have sold 800,000 copies of their book, fired their first agent, Christy Fletcher of Carlisle & Company, for Ms. Friedrich.