"Originally published as Black Mamba in 2022 in Great Britain by Atlantic Books, an imprint of Atlantic Books Ltd"--Title page verso.

Includes reading group guide.

""Daddy, there's a man in our room..." Alfie wakes one night to find his twin daughters at the foot of his bed, claiming there's a shadowy figure in their bedroom. When no such thing can be found, he assumes the girls had a nightmare. He isn't surprised that they're troubled. Grief has made its home at Hart House: nine months ago, the twins' mother Pippa died unexpectedly, leaving Alfie to raise them alone. And now, when the girls mention a new imaginary friend, it seems like a harmless coping mechanism. But the situation quickly develops into something more insidious. The girls set an extra place for him at the table. They whisper to him. They say he's going to take them away... Alfie calls upon Julia--Pippa's sister and a psychiatrist--to oust the malignant tenant from their lives. But as Alfie himself is haunted by visions and someone watches him at night, he begins to question the true character of the force that has poisoned his daughters' minds, with dark and violent consequences. Whatever this "friend" is, he doesn't want to leave. Alfie will have to confront his own shameful secrets, the dark past of Hart House, and even the bounds of reality--or risk taking part in an unspeakable tragedy"-- Provided by publisher.