A deaf catering worker who is struggling to make ends meet is called upon by a police detective superintendent to lip-read the conversations of criminals.

Determined to keep her meeting with Liam secret, Alison does not tell the police about Liam taking her to A&E; meanwhile, tensions flare at the Canterbury Tap as Liam's arrival leads to a confrontation with Alison's ex Eithan.

Alison's risky tactics identify the gang's target, but her deception and the gang's escalating violence threaten to unravel her relationship with Liam.

Alison is invited onto a lavish trip where Liam insists on adopting false identities; she discovers that he is using her as a cover; Alison is convinced that she can walk the fine line between her duty to the police and their undeniable connection.

Alison faces dangerous crossroads as her feelings for Liam threaten to undermine the police's investigation; the gang led by Braden executes their plan to steal the Joshi necklace using chaos and Liam's hacking to breach security.

Alison reels from Liam's betrayal, consumed with guilt over her role in the heist. But when her life is suddenly threatened, will Liam abandon his escape plan to save her?