" He gazed amusedly down the table at Tessa. “You’re the shape-changer, aren’t you?” he said. “Magnus Bane told me about you. No mark on you at all, they say.”
Tessa swallowed and looked him straight in the eye. They were discordantly human eyes, ordinary in his extraordinary face. “No. No mark.”
He grinned around his fork. “I do suppose they’ve looked everywhere?”
“I’m sure Will’s tried,” said Jessamine in a bored tone. "

― Cassandra Clare , Clockwork Prince (The Infernal Devices, #2)