"No," He agrees, and is probably lying. It would be surer and simpler to kill them. Something twists for the thought, bright as blood on marble, and Isaac blinks. "Could drug them, I suppose. A heavy hand at the bar."

That isn't sure, it isn't simple. If a neighbour tipped them off, then a neighbour saw two guards disappear here. Perhaps saw them enter. He glances for Bastien, sidelong:

"Do you trust the ship?"

Easier to move an additional three people, than find a new safehouse for sixteen. The fingers propping cellar door wobble.