John Grisham adaptation starring Milo Callaghan and John Slattery arrives on ITV1, STV and ITVX in SeptemberITV has acquired legal thriller series The Rainmaker, based on the bestselling novel by acclaimed author John Grisham, with the ten-part drama set to arrive on ITV1, STV and ITVX from 4 September. The series follows Rudy Baylor, a recent law school graduate who finds himself taking on a powerful courtroom veteran, Leo Drummond, while also facing complications involving his former law school girlfriend Sarah. The cast includes Milo Callaghan, John Slattery, Lana Parrilla, Madison Iseman, P.J. Produced by Lionsgate Television and Blumhouse Television, The Rainmaker has been developed for television by Michael Seitzman (Intelligence, Code Black) and Jason Richman (Stumptown). The drama will premiere on ITV1 and STV with a special double-bill at 9pm on 4 September, with all ten episodes available to stream immediately on ITVX.