What he'd suspected since she'd mentioned Montague being attacked within the wards. But as it made things easier for him (as in giving him a very limited list of people to look at) it didn't make it easier for her.
Someone had betrayed them, she knew it as well as he did.
'Are you sure he was attacked inside the wards?' Theo then asked, more for her benefit than his own. He was already making a ranking order of the people with access, trying to find the most likely one, the one to start with.
Bletchley - definitely unreliable, but did he know enough about Dark magic? Higgs - Somehow he didn't think so, he'd left town before this ever happened, though that in itself coudl be seen as suspicious. The Montague family...
He pushed the list away, knowing it did little use, instead he waited for Verity to answer his question and for her to finish up so that they could head back.
He'd start with Bletchley. He'd never liked the man after all.