It did not take the FBI long to have a suspect in the bombing. The same day that it discovered that its prime suspect was already in custody in a county jail, its number-two suspect, Terry Nichols, turned himself in to police in Herington, Kansas. He had heard his and his brother's names mentioned on the radio as possible suspects in the Oklahoma City bombing. In talking to the police, Nichols denied any knowledge of or involvement in the bombing, but he admitted that McVeigh had told him that "something big" was going to happen soon. He refused to explain to police what he meant in his letter to McVeigh (that his ex-wife had opened) when he told McVeigh to "Go for it!" A search of Nichols's home found ammonium nitrate, a receipt for the purchase that had both McVeigh's and Nichols's fingerprints on it...