Martin Kemp stars as serial killer George Joseph Smith in this made-for-TV crime drama based on a true story. In order to accumulate wealth Smith commits bigamy under various pseudonyms and kills three of his wives between 1910 and 1915. He tries to make it look as though the women died by accidentally drowning in their bathtubs but the deaths are eventually linked with Detective Inspector Arthur Neil (Alan McKenna) working to solve the case.