Yes – and it trailer dials up the eeriness, promising that both actor and audience will uncover the mystery of the child’s disappearance at the exact same time.

The film is an English-language remake of hit French thriller Mon Garcon, with the leading actor, Guillaume Canet, not being given a script in the original either. Christian Carion, who helmed the original French version, is returning to direct the remake.

Clearly, this being kept in the dark is a formula that works.

In the teaser, McAvoy speaks about his experience filming the thriller, saying: “I hope we’ll give the audience something really tangible that they can hang on as this thriller rattles on.”

Watch it below:

My Son: the trailer for James McAvoy and Claire Foy’s new thriller is haunting