The Cuckoo star Jill Halfpenny has explained that she joined the Channel 5 drama on one condition: she wanted to play the role of Sian.
In the four-part series, Jill joins The Cuckoo cast as a lodger who starts living with a struggling couple and their adoptive daughter, who took her in due to financial pressures. At first, things seem pretty normal, but it takes a much darker turn.
