Professor Lou Schlesinger and Detective Jackie Sebire unravel the case of master manipulator Peter Tobin, who murdered 23-year-old student Angelika Kluk in 2006.
Focusing on Altemio Sanchez, an unlikely killer and the seemingly perfect neighbour.
Couple Alton Coleman and Debra Brown terrorised America's Midwest in 1984, killing eight people.
Twisted killer Stephen Griffiths murdered three women in Yorkshire in 2009 and 2010.
`Teacup Poisoner' Graham Young was just 14 when he killed his stepmother, who was his first victim.
Joanna Dennehy is serving a life sentence for killing three men in Peterborough in 2013.