When Claire Morris (Sheridan Smith) confronts her new husband, Malcolm Webster (Reece Shearsmith), over his wild spending, he tries to control her with sedatives. Afraid he’ll soon be caught, he silences her once and for all. Three years on, he has a new bride … and history appears to be repeating itself.
After two failed attempts on Felicity’s (Kate Fleetwood) life, Malcolm (Reece Shearsmith) returns to Scotland and reinvents himself — this time as a perfect boyfriend to Simone (Archie Panjabi). However, DS Henry (John Hannah) is hot on his heels and will stop at nothing to prevent the next murder.
As Malcolm (Reece Shearsmith) continues to evade capture and plots to bigamously marry Simone (Archie Panjabi), DS Henry (John Hannah) is being thwarted at every step of his investigation. Time is running out when he stumbles across a legal ruling that could ultimately lead to Malcolm’s downfall.