Suave, sophisticated Detective Inspector Lynley (Nathaniel Parker) and his prickly, plebeian sidekick Detective Sergeant Havers (Sharon Small) are back with two new gripping mysteries in this sixth and final series. But with Lynley struggling to cope with his wife's death-and Havers struggling with her partner's heavy drinking-will they be able to focus on catching criminals?

Limbo:
Fifteen years have passed since Lynley's five-year-old godson, Justin Oborne, went missing, when Lynley receives a call from Justin's father saying that a body has finally been found. Still struggling to come to terms with his wife's death and drinking heavily, Lynley sets about helping his friend with the renewed enquiry. The Oborne's estranged daughter, Julia, refuses to come home for her brother's funeral, so Lynley volunteers to go to Rome and try to change her mind. But Julia is now an attractive 30-year-old woman and on returning to London the two drown their sorrows in a local wine bar and Julia seduces Lynley. It is the first woman he has slept with since Helen died, and he wakes to police storming his apartment; Julia is dead on the pavement below. Did Julia commit suicide, or was she killed? Lynley is convinced the answer lies in the uncovering the truth of what happened to Justin. And with the police thinking he is a prime suspect if Julia was murdered, Lynley's only hope is to reexamine the past-even if it means admitting the role he played in putting the wrong man behind bars.

Know Thine Enemy:
A little more than a week after her disappearance, the body of a missing schoolgirl is discovered in a lake, wrapped in rubble sacks and chains. The post-mortem reveals sexual assault, and though she appears to have taken her own life, the bruising on her hands and estimated time of death-around 48 hours earlier-indicate that she had been held captive for up to a week. While Lynley and Havers are busy with the case, a second schoolgirl is reported missing. After a nasty fight with her mother, Kelly Stevens stormed off to her boyfriend's house but never arrived. Finding Kelly quickly becomes even more important when her mother reveals that Kelly is diabetic and will slip into a coma without insulin. Despite the urgency, however, door-to-door enquiries are stopped by an Assistant Commissioner wary of public alarm. Luckily, Havers has already found one witness who saw a red-haired woman asking a girl matching Kelly's description for directions. When the mysterious redhead turns up in the emergency room, a victim of domestic abuse, Havers is sure the husband is the man they're looking for-but can she prove it in time?