In the lobby of the Ritz-Carlton hotel in midtown Manhattan, Rebecca Romijn is waiting for her costar, Jon Tenney, to arrive. She places a playfully brusque reminder call to his cell, then declares with a good-natured sigh, "He's probably upstairs blowing out his hair." And there you have it: The secret sauce in King & Maxwell, this summer's new procedural about two Washington, D.C.-based former Secret Service agents-turned-private eyes. The case of the week is secondary only to the playful rapport between the two leads. We sat down with the pair to investigate their spark.