Duplicity

Oliver and Claire Ramsey's lives are blown apart when Oliver is charged with the brutal murder of three middle-aged men. Oliver appears to be genuine when he claims he's innocent.

Despite the overwhelming evidence DI Rachel Sharp is not convinced of Ramsey's guilt. She would like to take the investigation further but is overruled.

Ramsey is convicted.

Six years later it comes to Rachel's attention that murders with very similar MO's have occurred in England and across parts of Europe. Now a DCI, Rachel re-opens the investigation, and discovers new evidence that leads her to England.

Is there a copy-cat killer out there or was Oliver Ramsey somehow framed for the Australian murders?