If you've been following Marcella this series, you'll know it's been a slow (and sometimes confusing) journey towards the final reveal of the killer.
However, with just one episode to go until next week's finale, Monday night's (April 2) penultimate instalment may have finally let us know just who is behind the grisly deaths of 17 children – and it was a huge shock.
See, Marcella grasped that Jane Colletti was more involved in Debbie Canavan's death than she first thought.
Debbie and Jane had gone backstage at a rock gig and ended up having sex with the older band members.
Jane slept with the lead singer and left afterwards, but Debbie stayed on after going to bed with the band's bassist, Reg, who found her dead after she took too many drugs and buried her in his garden.
Meanwhile, Marcella realised that whoever was killing the children had a method of 'protecting them from evil' so their purity would remain intact. Soon, she deduced that the killer was probably a woman.
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Things took a turn when Marcella's son Edward went to visit his ex-girlfriend Samantha at her home, but she wasn't there. However, Jane – Samantha's mum – was in and offered the schoolboy a cup of hot chocolate.
Jane, after earlier noticing a bruise on Samantha's leg, was concerned that Edward was injuring her and spoke to him about how children should be protected from hurting others.
"Bad things happen and one day it all becomes too much," she said. "Even though you know how horrible it is to be hurt, you start hurting others. It's a vicious circle... But it can be broken."
Then, we saw Edward collapsed on the floor.
Did Jane poison Edward's hot chocolate? Is Jane just one out of a gang of killers, joining up with Rosio's possible killer Sascha? Whatever the case, viewers' heads are spinning with theories now.
Hopefully, all our answers will be revealed when Marcella concludes series two next Monday (April 9) at 9pm on ITV.
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Adam Silverstein is a freelance sub-editor and writer at Digital Spy, and he specialises in music, TV and movies.
