The Inspector Lynley Mysteries (2002)

S4E3 The Seed of Cunning

Lynley and Havers delve into the murder of a porter at the House of Lords. Initially, it appears that the killing could be linked to the victim's gambling debts. However, the situation escalates when a senior clerk is also found dead, revealing a conspiracy tied to pilfered test reports related to a new missile system. As Havers investigates the whereabouts of the missing documents, she discovers that both she and Lynley are being watched...