Thief of Time - Ink

And then she saw the inkwell on her desk beginning to rise like Penelope's hand. It was a ceramic pot, made to drop neatly into a round hole in the woodwork. It came up smoothly, and turned out to be balanced on the cheerful skull of the Death of Rats. It winked one blue-glowing eye socket at Miss Susan.

With quick little movements, not even looking down, she whisked the inkwell aside with one hand and reached for a thick volume of stories with the other. She brought it down so hard on the hole that blue-black ink splashed onto the cobbles. Then she raised the desk lid and peeped inside. There was, of course, nothing there. At least, nothing macabre...

... unless you counted the piece of chocolate half gnawed by rat teeth and a note in heavy gothic lettering saying: SEE ME and signed by a very familiar alpha-and-omega symbol and the word Grandfather

The Thief of Time - p30-31