Page "Lullaby (novel)" Paragraph 7

In addition to tracking down and destroying any copy of Poems and Rhymes Around the World, the foursome hope to find a " grimoire ", a hypothesized spellbook that is the source of the culling spell.

Streator wants to destroy it while the others in his group want to learn what other spells it contains — partly in the hope that there is a spell to resurrect the dead.

Mona eventually figures out that the datebook Helen had been carrying throughout the trip is the grimoire they had been looking for, written in invisible ink.

Helen had acquired it years earlier in the estate of the publisher of Poems and Rhymes Around the World whom she had killed with the culling spell.

In the end, the grimoire is used and misused until Helen's body ends up dead with her mind in a police sergeant's body.

This connection is made in the final chapters and concludes with the present ; Streator and Helen ( in the police sergeant's body ) are together, searching for Mona and Oyster who have the entirety of the grimoire with the exception of the " culling song ".