As you might expect for someone who’s Deaf, Alison Brooks (Ayling-Ellis) is a brilliant lip-reader. So good, in fact, that DS Ashleigh Francis (Charlotte Ritchie, Ghosts) and DI James Marsh (Andrew Buchan, Black Doves) have a job for her. The police have been following a gang who are planning a robbery, and careful to meet in places where listening devices can’t be planted. It falls to Brooks to watch the silent surveillance footage and decode what’s being said.

Things are going well, until she starts to bond with gang member Liam Barlow (Kieron Moore, Masters of the Air). Brooks wants to get closer to find out as much as possible, but Francis and Marsh have their doubts. Proximity is a two-way street: the closer the gang is to her, the better their odds of finding out who she really is.

“We were so clear to you about the dangers,” Francis warns in the trailer.

Code of Silence airs on ITV1 on 18 May, when it will also be available on ITVX.