When dusk at last comes it comes from the corners, where it’s been waiting all day, and seeps through Slough House the way ink seeps through water; first casting tendrils, then becoming smoky black cloud, and at last being everywhere, the way it always wants to be. Its older brother night has broader footfall, louder voice, but dusk is the family sneak, a hoarder of secrets. In each of the offices it prowls by the walls, licking the skirting boards, testing the pipes, and out on the landings it fondles doorknobs, slips through keyholes, and is content. It leans hard against the front door – which never opens, never closes – and pushes softly on the back, which jams in all weathers; it presses down on every stair at once, making none of them creak, and peers through both sides of each window. In locked drawers it hunts for its infant siblings, and with every one it finds it grows a little darker. Dusk is a temporary creature, and always has been. The faster it feeds, the sooner it yields to the night.
But for now it’s here in Slough House, and as it moves, as it swells, it gathers up all traces of the day and cradles them in its smoky fingers, squeezing them for the secrets they contain. It listens to the conversations that took place within these walls, all faded to whispers now, inaudible to human ears, and gorges on them. From behind a radiator in Shirley Dander’s office it collects the memory of her unfolding a wrap of paper and snorting its contents through a five-pound note. ‘Back to zero,’ Shirley said aloud once she was done, and though dusk has no understanding of the words – has no vocabulary at all – it takes her tone of defiant regret and adds it to its purse. In Roderick Ho’s empty room it finds nothing, but on the next floor there are moments of interest, items to ponder. Louisa Guy has left a trace of scent behind: dusk has no sense of smell, but there’s a familiarity of intent here, a lingering sense of purpose it recognises. Dusk has seen a lot of action in its time. It appreciates the efforts that go into such occasions.
And in the companion office it dawdles longer, savouring the remnants of the day. It can still hear River Cartwright’s recent phone call, a call consisting of one word only,
There are more stairs, and dusk has already climbed them. In Catherine Standish’s room, it now remembers, it lay beneath a filing cabinet while Diana Taverner described Catherine’s former boss’s final moments; how Jackson Lamb murdered Charles Partner in his bathtub; a sanctioned murder, but a murder all the same; one which precipitated Lamb’s exile, and gifted him Slough House. The life Catherine now leads is built on the proceeds of Jackson Lamb’s crime. Diana Taverner just thought she should know that. And once Taverner had left, dusk waited for Catherine to weep, or shout, or rage, but it heard nothing; and when time came for it to creep from its hiding places, it found the room empty, and Catherine Standish gone.
So at last dusk comes to Jackson Lamb’s office, where, of course, it’s already waiting. And finds there is nothing to find there, for Jackson Lamb carries his own darkness with him, and is careful not to leave any lying in unregarded corners. All that remains of his recent presence, spillage of whisky and ash aside, is a soiled and rotten handkerchief hanging off the lip of a bin. Dusk considers this, and adds it to its knowledge of the day; knowledge it will abandon soon, for this is the rule, in London and elsewhere: everything that happens – good and bad – dusk clocks, absorbs, then mostly forgets. For if dusk remembered everything the weight would nail it in place, keeping it from its eternal search for its twin, the dawn, which it has never met. Always, it’s halfway behind, or halfway ahead. It’s never known which.