Soon after his poetry recital, Leonard Quinton is found hanging in the conservatory. When Father Brown realises that he could not have committed suicide, the search begins for a murderer.

A couple in France turn to Eric and his team to rescue their daughter who was abducted from a train and fear has been sold into human trafficking.

As Victor struggles to resurrect Brona, Ethan prepares to leave London and Malcolm discovers that Vanessa is plagued by new visions.

While Ferdinand helps Malcolm decipher Brother Gregory’s writings, Vanessa helps Victor pick a dress for his cousin. Meanwhile, Dorian takes Angelique on a date, and Ethan rescues a young woman…

Malcolm learns of his wife’s death but isn’t as upset as Ethan and Vanessa believe he should be. Meanwhile, Ethan asks Sembene for a favor, and Dorian sends out invitations…

While Evelyn torments Malcolm, Victor summons Ethan and Vanessa back to London to rescue their friend. Meanwhile, Brona learns Dorian’s secret, and Caliban is betrayed.

Vanessa has to use all of her strength to try and defeat the demon.

The president of the USA makes an unexpected stop in London. Tom and his team are forced to work with the CIA. A power struggle between the two secret organizations…