Battersea has a particular place in the London imagination: south of the river, working, unglamorous, and close enough to the water to have always had somewhere to drink. Kitty Neale sets A Family Secret under the Battersea Tavern banner, and the pairing of place and pub does most of the scene-setting before anything else happens.
The title names its engine plainly. A secret held inside a family is among the oldest devices there is, because it works: it puts pressure on every conversation and hands the listener something to hold that the characters cannot yet say aloud. At nearly ten hours this is full-length storytelling, with the room to let that pressure build slowly.