No one knows the story behind the sensational headlines of the Scott Peterson murder trial better than defense attorney Matt Dalton. For six straight months after Peterson's arrest, Dalton was the defense's only full-time investigative attorney on the case. During that time, he lived in Modesto and investigated every element of the case, interviewing scores of witnesses, reviewing more than 35,000 pages of police documents, and meeting almost daily with Scott Peterson in jail.

What he has uncovered will astound even the most informed observers of the Laci Peterson murder case and...