Mehmed's troops advance into Wallachia, and Vlad employs guerrilla tactics to weaken his rival. A threat lurks in the imperial palace.

Diane must wear a court-ordered breathalyzer bracelet, but it jeopardizes her living out one of her biggest dreams. Daniel's boss loses control.

With Park Yeon-jin's wedding on the way, Dong-eun's revenge rolls out according to plan. Meanwhile, a fateful encounter at a hospital takes place.

Raúl moves in with Santi who's having mixed success on his dates. Daniela's career is going well, much to Pedro's chagrin. Esther tries some medication.

The dead speak.

April 1968. Racial tensions cast a shadow over Poplar, Nancy's eyes are opened when she supports a dying woman, and Nonnatus House welcomes a new sister.

When Catherine discovers the remains of a murder victim, it bizarrely leads her straight back to Tommy Lee Royce.

Desperate for a baby, Allison and Deacon rob their dodgy boss Alfie to pay for IVF. Can they get away with it?

As Allison starts IVF, pressure mounts. Deacon asks his creepy uncle to help launder it. Meanwhile, HMRC launch an investigation.