Vince Whitman becomes prime suspect this week, and as the twists pile up, you sense Marcella is winding up for a climactic endgame.

There are developments in the case of Debbie Canavan, who disappeared after Reg Reynolds’ concert more than 30 years ago – is it related to the child murders?

Whether it’s the breakthrough Marcella needs or a red herring is anyone’s guess, but distant plotlines converge as unlikely new suspects emerge.