Terrified of arrest, Andrew enlists Luke's help as an alibi, but Laura won't give up easily; violent consequences are imminent.

A man from Laura's past visits Andrew and reveals some powerful information about her; Laura realizes she must turn to Andrew for help with a student.

Laura's resolve to bring Andrew to justice deepens and she enlists Tom's help in her plan.

The deeply corrosive influence of an old acquaintance becomes clear for Andrew. Meanwhile, the tragic recent history of Laura's family helps explain the deep bond she and Katy share, as well as the lengths Laura will go to for those she loves.

Feeling the full force of DI Renton's investigation, Laura looks to those closest to her for support. But when suspicions fall on Ian, Laura is left questioning who she can trust.

A vital piece of evidence comes to light. Laura, blindsided, seeks to discover its origin, and with Katy and Liam's help, she's led to a startling new suspect.