The person we think is the villain is actually working for a bigger villain.
The narrator is unreliable and half the plot never happened.
Reginald Gump is actually Polly Vader's son, time travelling.
A religious text shows that Polly Vader was always destined to save the day.
Gemma MacDonald is actually Polly Vader's mother.
A perceived misfortune in Polly Vader's past was actually set up to protect her.
Polly Vader was bitten by a vampire much earlier in the story but signs were delayed.
The whole plot is a premonition, not reality.
Gemma MacDonald faked her own disappearance.
Reginald Gump was just using Polly Vader to look good in court.
Reginald Gump has been dead all along.
The person claiming to be Gemma MacDonald is actually one of her triplets.
Gemma MacDonald was adopted and didn't know.
Earth has been destroyed and they're all living in a virtual reality.
It turns out Gemma MacDonald only exists in the cloud.
Gemma MacDonald is actually a 100-year-old woman with a growth disorder.
Polly Vader's dream was not a premonition and meant nothing.
Gemma MacDonald is head of the criminal organisation they've been fighting.
Reginald Gump and Gemma MacDonald are both manifestations of Polly Vader's subconscious.
The goodies and the baddies all actually want the same outcome and have to work together in the end.
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From @vhhau