Kept as guests in the Detroit offices of Federated Oil and Chemical, the investigators meet the company's hunters, its doctor, and its basement — and a phonograph record names the ninth planet. Then a telegram sends them north to a Quebec pulp-mill town where two men were found without their brains.

The investigators receive a letter from the country’s greatest occult scholar, Étienne-Laurent de Marigny. It mentions the unsolved murder of a reporter, a possible conspiracy, and a peculiar drawing found clutched in the dead man’s hand. Being occult in nature, but unable to devote the time and effort needed to identify it, he requests their consultation.

The morning after the fires: cells, charge lists, and a body identified only by its watch — then charges that evaporate overnight, a lawyer with a checkbook, a seaplane west, and the crippled millionaire who has been hunting the enemy for eight years.

The investigators receive a letter from the country’s greatest occult scholar, Étienne-Laurent de Marigny. It mentions the unsolved murder of a reporter, a possible conspiracy, and a peculiar drawing found clutched in the dead man’s hand. Being occult in nature, but unable to devote the time and effort needed to identify it, he requests their consultation.

A professor murdered to keep his brain, a gangster's last chance at revenge, a campus that ate something and forgot how to be human — and the night the Orne Library burned.

The investigators receive a letter from the country’s greatest occult scholar, Étienne-Laurent de Marigny. It mentions the unsolved murder of a reporter, a possible conspiracy, and a peculiar drawing found clutched in the dead man’s hand. Being occult in nature, but unable to devote the time and effort needed to identify it, he requests their consultation.

A hostage standoff with the mob, a brain harvested by lamplight, a photograph destroyed by exhaustion, and a plate of food that no one should have eaten.

The investigators receive a letter from the country’s greatest occult scholar, Étienne-Laurent de Marigny. It mentions the unsolved murder of a reporter, a possible conspiracy, and a peculiar drawing found clutched in the dead man’s hand. Being occult in nature, but unable to devote the time and effort needed to identify it, he requests their consultation.