“Hunger presently raised its insistent voice, darkening Doyle’s mood. Yes, Sparks had pulled his fat out of the fire on more than one occasion. Nothing in his actions suggested he was anything other than what he represented himself to be, but he remained impenetrable, and the cloaking of royal secrecy around his true purpose rang discordantly. Doyle was in no position to reject the man’s assistance, no more than he was of a mind to forfeit his surprisingly welcome company, but common sense prevented the full conferring of his trust. It was as if he were traveling with an exotic jungle cat, its defensive abilities beyond reproach but whose very nature demanded of its keeper a tireless, wary scrutiny.
“Perhaps if he questioned Sparks more cleverly, he’d inadvertently yield up details from which the astute observer could assemble a more telling portrait of the man.”
Frost, Mark. “By Land and Sea.” The List of Seven.