A British intelligence officer Kate Henderson races against time to uncover a UK politician's potential ties with the Kremlin, risking her reputation and family, as a murder and election loom.

The true story of a controversial honeytrap at the heart of the 1992 police investigation into the murder of a young mother in London. Examining the complicated and toxic sexual politics of the early ‘90s and the police’s obsession with the wrong man, Deceit enters a dysfunctional world, where a female undercover officer, codename ‘Lizzie James’, is asked to become sexual bait for a suspected killer.