The Revels by Stacey Thomas

What I am has never openly been whispered of, yet it is enough that people would hang for it.'

England, 1645. After his half-brother dies, aspiring playwright Nicholas Pearce is apprenticed to Judge William Percival, an infamous former witch-hunter who is under pressure to resume his old profession. In a country torn apart by civil war, with escalating tensions between Catholics and Protestants, Royalists and Roundheads, and rumours of witchcraft, Nicholas hides a secret: the dead sing.

He hears their secrets, but will he find the courage to speak up to save innocent lives, even if it means putting himself in great danger?