Recruited by DI James Marsh and DS Ashleigh Francis, Alison proves invaluable as she assists in surveilling a gang planning a major heist, while she also has to navigate her mother's financial struggles, a broken relationship, and the ableist attitudes she encounters at work. As Alison dives deeper, her exceptional lip-reading skills pull her into the police’s investigation, but her undeniable connection with criminal Liam Barlow threatens everything.