There is movement behind him, and Catherine Standish enters, bearing a cup of tea. This she deposits on Lamb’s desk before departing again, no word having been spoken during the transaction. But Standish, though she doesn’t know it, occupies a place in what Lamb, when he’s forced to acknowledge it, thinks of as his conscience, for another lesson he has long absorbed, and one hardly limited to the Intelligence sphere, is that actions have consequences which harm and ensnare others.
Once, in exchange for a service, Lamb revealed to Roderick Ho the sin that had left him in Slough House, and his story — that he had been responsible for an agent’s death — was, like all the best lies, true, though rendered harmless by the omission of details; that, for instance, it was Charles Partner’s death for which he had been responsible, an execution sanctioned by, among others, River Cartwright’s grandfather. For this act, Lamb’s reward was Slough House. Lamb, then, went to the well for peace and quiet, for a sanctuary in which to indulge his ironic self-disgust, and the killing of his former friend and mentor does not disturb his sleep. But the fact that it was, inevitably, Catherine Standish who found her boss’s body has been known to give him pause. Having found bodies in his time, Lamb is aware that such moments leave a scar. He has no intention of attempting to make amends for this, but if it lies within his power to do so, he will prevent further injury to her.
— Slow Horses (Mick Herron), Loc. 5796–807