The Cuckoo Channel 5 'plot twist' predicted after Jill Halfpenny cliff-hanger

Channel 5 viewers are predicting a major 'plot twist' for new drama The Cuckoo, after its main star Jill Halfpenny was at the centre of a gripping cliff-hanger.

Having starred in Channel 5 dramas The Drowning and The Holiday, both of which went onto be big binge watch hits on Netflix, Jill is back on screen this week in The Cuckoo, playing Sian, a mysterious lodger who imposes herself on the lives of married couple Nick and Jessica, played by Hunt for Raoul Moat star Lee Ingelby and ex Casualty actress Claire Goose and quickly establishes a connection with their adopted teenage daughter Alice.

The fact that Sian is Alice's real mother or at least believes she is, was something many viewers claim to have clocked early doors, with their instincts proving to be spot on as the final moments of Monday's first episode saw Sian on the phone saying she was getting her 'baby back.' There was plenty of drama on Tuesday night, when a pawn shop receipt found by Sian stirred up trouble between Nick and Jessica, as they wrestled with whether they should finally come clean to Alice about her being adopted.

READ MORE: Channel 5's The Cuckoo 'forces' popular show off air as viewers complain

Get all the latest TV and showbiz news and gossip from Chronicle Live with our free newsletter..

Alice ended up storming out of the house and driving away, before crashing the car as Sian led her to safety and whispered 'I thought I'd lost you again' before then telling the troubled youngster n her room, out of ear shot of Nick and Jessica, that she was her mum.

Tuesday's second part of The Cuckoo also saw the introduction of a character thought to be Sian's Aunt Fay, who Sian went to visit and it's something said by Fay that Alice 'couldn't be' Sian's daughter that fuelled speculation from some viewers that Sian actually has the wrong girl and isn't Alice's mother.

Making that call on X ahead of episode three airing on Wednesday night, one fan wrote: "So I guessed that she thinks she is the mother early in episode one, but now I'm starting to think that she isn't. Maybe she had a still born on that date and obsesses about a child born at the same time in the same place Her Aunt said, "She can't be."'

Thinking along the same lines, a second posted: "Sian's got the wrong child hasn't she??.. the way Auntie Fay said "it can't be" got me thinking..enjoying #TheCuckoo so far. @halfpennyjill does a good drama that's for sure!!"