Kate M Williams Books in Order

Teen babysitter Esme Pearl develops strange powers and attracts the attention of newcomer Cassandra Heaven. Together they discover that their babysitting legacy involves witchcraft and protecting the innocent from demons, adding supernatural danger to ordinary teenage responsibilities.

Esme and Cassandra attend a rare gathering of magically gifted Sitters, hoping for training and answers. As Cassandra behaves strangely and Esme's personal worries mount, the poorly managed summit raises a more urgent question: who is protecting the children?

Esme struggles to lift her mother's curse while hoping a gathering with friends will brighten her winter. A suspicious new band brings signs of dangerous magic to Spring River, drawing the babysitting witches into another threat against their town.

Ten young influencers receive invitations to Unknown Island, an exclusive luxury destination. Their dream trip turns deadly when they discover that each guest carries a dark secret and someone has assembled them for revenge rather than a vacation.