Channeling sibling rivalries and deadly childhood pacts, Evil Twins follows true-crime mysteries surrounding real-life cases of these evil archetypes. We examine the odd and fascinating world of twins, the secret languages they create and their identical looks. We also look at the stories about how one twin can feel when the other is hurt and how when a twin goes bad, they go really bad. What happens when one twin set their other up for murder, commit armed robbery or terrorise an entire city. Each episode reveals shocking stories of twins on the edge, from those who sleep with their twin's husband and set them up for murder to those who steal their identities and even come back from the dead.