“Is that even legal?” Evie said.

“Charming lady!” Dr. Poblocki laughed and patted Evie’s hand. “Are you certain you’re related to that one?” He nodded at Will, and Evie had to fight the urge to giggle.

“Eschatology,” Dr. Poblocki continued, “from the Greek eschatos, meaning ‘the last,’ is about the end of the world and the second coming of Jesus Christ. Ah, but here is where things become quite interesting!”

Evie’s eyes widened. “More interesting than dope and sorcery?”

“Indeed! You see, the Brethren didn’t just believe that the end of the world was nigh; they thought it their God-given duty to help bring it about.”

“How did they plan to do that?” Will asked.

“By raising the anti-Christ. The Beast himself.” Dr. Poblocki paused to allow his words time to settle. Evie’s skin prickled with goose bumps.

“Why would they do that if they were Christians?” Evie asked.

“The line between faith and fanaticism is a constantly shifting one,” Dr. Poblocki said. “When does belief become justification? When does right become rationale and crusade become crime?”

“How did they intend to raise the Beast, Georg?” Will asked.

“With this.” Dr. Poblocki reached into his pile of books and produced a gnarled, leather-bound volume. “The eleven offerings. It’s a sacrificial ritual, both magical and religious in origin, for manifesting the Beast here on earth.”

The book was very old, and the thin, veined paper felt leathery against Evie’s fingers. It reminded her very much of some macabre illuminated Bible. Each page featured a small, colorful illustration of a ritual murder, accompanied by a scripture-like passage. The same sigils found on the killer’s notes also ran along the edges of the book’s entries.

Evie read the offerings aloud in order. “The Sacrifice of the Faithful. The Tribute of the Ten Servants of the Master. The Pale Horseman Riding Death Before the Stars. The Death of the Virgin. The Harlot Adorned and Cast upon the Sea…” The drawing was of a sightless, bejeweled woman arranged on water, surrounded by pearls. Above her head was an eye symbol. “Unc,” Evie said, shivering. “It’s just the way Ruta Badowski’s body was found.”

Will reached over Evie and turned to the next page. “The sixth offering, the Sacrifice of the Idle Son…” The illustration showed a boy hung upside down with one leg bent, like the Hanging Man of the tarot. The boy’s hands were missing, and a pair of hands bent in prayer was the symbol above the drawing. “Tommy Duffy.”

Evie read on. “The seventh offering, the Turning Out of the Deceitful Brethren from the Temple of Solomon.” She raised her head, thinking. “It’s a template for the murders.” She continued. “The eighth offering, the Veneration of the Angelic Herald. The ninth, the Destruction of the Golden Idol. The tenth, the Lamentation of the Widow. The eleventh offering, the Marriage of the Beast and the Woman Clothed in the Sun.”

The last page was a drawing of a bestial, horned man with the feet of a goat, two enormous wings, and a tail. He sat upon a throne and his eyes burned. In his hand was a dripping heart. At his feet was a woman wearing a golden crown and dress, her chest torn open. The symbol at the bottom was a comet. It made Evie shudder.

“Does it say how the Beast was supposed to come into this world?”

“It’s unclear. It says only that they needed a chosen one.”

“A chosen one to commit the murders?” Evie clarified.

Dr. Poblocki gave a small shrug. “There, I’m afraid, I can only conjecture.”

“What is this?” Evie pointed to a page near the back. It showed a man kneeling before another man in dark robes, possibly a minister. The Pentacle of the Beast hung over them both like a sun, and heavenly spirits floated nearby. Piles of kindling had been gathered. The minister placed a pendant around the kneeling man’s neck.

“That’s just like the pendant Jacob Call was wearing,” Evie said. “What is the pendant for?”

“Possibly to signify to others that they are members of the same tribe, much like a cross or a Star of David,” Dr. Poblocki said. “Though I cannot say that for certain.”

“What is the next offering?” Will asked.

Evie flipped back. “ ‘The seventh offering: the Turning Out of the Deceitful Brethren from the Temple of Solomon.’ Whatever that means.” Evie turned to Dr. Poblocki. “Do you suppose our killer believes the comet is some sort of sign?”