Are you sure, Ignatius dear? I don’t think Miss Knight would disappear without leaving a note.
— Doretta telling her husband something after being injected

Doretta Knight is the mother of Cleo Knight, the wife of Ignatius Knight, and one of the owners of Ink Inc.

During the duration of Lemony Snicket’s stay in Stain'd-by-the-Sea, she and her husband were injected with laudanum by Dr. Flammarion.