Calculating. Cunning. Cold as ice. In Diabolical, a new gripping ten-episode series on Investigation Discovery, these shockingly devious masterminds use their wits and wiles to manipulate us, seduce us and try to get away with murder.

Neal Jacobson was a loving father with a perfect family, or so it seemed. What would possess him to kill his wife and twin boys in the middle of the night? Christine Billis was your average...