Clover was an occult bookstore owner in his sixties. He was nearly bald, with a long, thin tapered beard, braded at the end and sealed with a silver bead. Freddie knew him, and knew he had known Jane Quaint, so she went to ask him for information after Charlotte's abduction. He seemed reluctant to share what he knew about Jane, Sid and Sadie, and their followers, but relented when Freddie told him Jane kidnapped Charlotte. In the end, he said he thought Sid and Sadie were still alive and in hiding after something went wrong.
He was actually on the villian's side the whole time, waiting for Sid and Sadie to return and gathering everything they needed to "defeat death."
When the twins returned to his shop, they snapped his neck, and the neck of his shop assistant, Cressida.