Zoe Tapper plays Laura's sister Katy in Liar

Zoe Tapper graduated from the Academy Drama School in London just days before she began her career in movies.

Her first role was in the 2004 film Stage Beauty, with Billy Crudup and Claire Danes, followed by a role in Mrs Palfrey at the Claremont, alongside Joan Plowright and Rupert Friend.

Later she went on to appear in several British TV series, including the fantasy drama Demons, with Philip Glenister, and the period drama Desperate Romantics.

But, like her Liar co-star Joanne Froggatt, she is probably best known for her role in a popular period drama.

Tapper played showgirl-turned-actress Ellen Love, the love interest of Harry Selfridge in Mr Selfridge. Ellen wasn't around for long, but she made a big impression when she humiliated Harry in front of an audience in the final episode of season one.

Katy and her husband Liam, played by Richie Campbell

In Liar, Tapper plays Katy Sutcliffe, a nurse, wife and mother of two and the older sister of Joanne Froggatt’s character Laura.

Katy plays a part in setting up Laura on a date with her co-worker Andrew. When Laura accuses Andrew of rape, Katy is shocked and does her best to support her sister.

But Katy has a secret of her own that could turn her life upside down. Will she be able to keep it?

Watch a new episode of Liar Sundays on TVNZ 1 and OnDemand. Meet Tapper’s co-stars Joanne Froggatt, Ioan Gruffudd and Warren Brown.