The Harker File Books in Order

Investigative reporter Harker exposes men demanding ransom from families of missing Vietnam veterans. Pursuing the fraud leads him toward security contractor D. Z. Vale, whose private army makes publishing the truth a potentially lethal undertaking.

Apparently unrelated deaths in Wisconsin and Iowa lead Harker to a CIA conspiracy. His source reveals that the victims were defectors living under assumed identities, and that the investigative reporter himself could be the next target.

Anna Alexander has evidence of concealed dangers at a nuclear company, but dies before meeting Harker. The missing documents and apparent accident send the reporter after a conspiracy whose organizers have already shown they will kill witnesses.

Harker investigates after a senator's daughter disappears and evidence points to the Children's Crusade. Behind the cult's peaceful image, violent enforcers keep followers obedient and threaten the reporter as he presses toward the truth.