This discussion may contain spoilers!
At The Crooked Man's trial, everyone seemed fixed on the idea that he was guilty of murdering the girls despite explaining himself earlier how he couldn't be. He told Georgie to "take care of it" when dealing with the girls. Georgie then got paranoid and killed them out of fear of being "dealt with". Then Nerissa later admits that she lied about hearing The Crooked Man giving any orders.
It seems like The Crooked Man was actually innocent of the murders after all.