Slater and Page are called to a break-in and discover a woman drowned in her own bath. Initially, the woman's ex-partner is suspected of murder when her GP confirms that she was in hiding from him to prevent him getting access to their unborn baby. However, Slater's interview with a tenant in the same housing block soon reveals an alternative cause of death, and Monroe pursues the woman's dodgy landlord for manslaughter, for reconnecting a dangerous water heater leaking carbon monoxide.