Elizabeth Day’s The Party Premieres Today: Cast, Plot and How to Watch

By Ahaqir Ishaq

Elizabeth Day’s The Party arrives on television today, October 11, 2026, bringing its story of friendship, obsession and privilege to ITV1 and ITVX. Luke Evans and Tom Cullen lead the five-part adaptation, with Sarah Solemani writing the series and appearing in a major role.

For readers, the appeal goes beyond another thriller about wealthy people behaving badly. At the center of The Party is an unequal friendship: one man has spent his life wanting to belong, while the other has rarely had to question whether he does.

Here is what to know about the premiere, the cast and the changes already confirmed for the adaptation.

When Does The Party Premiere?

The Party premieres in the UK on Sunday, October 11, 2026. Radio Times reports a 9 p.m. ITV1 debut, with the drama also available to stream on ITVX. Its report lists further broadcasts on October 12 and October 13.

The series consists of five episodes. ITV’s announcement also names STV and STV Player among its broadcast and streaming outlets.

These are UK viewing details. The sources checked for this article do not establish a U.S. premiere date or streaming platform.

What Is The Party About?

Martin Gilmour and Ben Fitzmaurice have known each other since boarding school. Martin, raised by his working-class mother, enters that world through a scholarship. Ben belongs to a wealthy aristocratic family and offers Martin access to the acceptance he desperately wants.

Decades later, their friendship faces a crisis at Ben’s lavish birthday celebration. A Conservative leadership vacancy creates an opportunity for Ben, but Martin fears the attention could expose secrets from their shared past.

According to ITV’s official synopsis, the series moves between the party, the subsequent police investigation and earlier periods in the men’s lives.

That structure gives the adaptation two questions to explore: what happened at the celebration, and how did this friendship become so dangerous?

Who Is in The Party Cast?

The principal cast includes:

Solemani has a particularly significant role in the production: she adapts Day’s novel while playing Lucy, who attends the party alongside Martin.

Viviane Andereggen directs the series. World Productions produces it in association with Stoic Productions and ITV Studios, with Evans, Day and Solemani among the executive producers.

Which Elizabeth Day Book Is the Series Based On?

The adaptation is based on Day’s 2017 novel, The Party.

The publisher’s description of the book places Martin and Ben’s relationship at its center. They have been friends for 25 years, and Martin has protected Ben’s secret for more than two decades.

Ben’s 40th birthday brings together politicians, celebrities and wealthy guests. Martin’s discomfort persists despite his long association with the family, while Lucy senses something unsettling beneath the celebrations.

This is the book’s most interesting premise: proximity to privilege does not necessarily produce security. Being invited into someone’s world can leave a person more dependent on that invitation.

Want to read the novel before watching? Find Elizabeth Day’s The Party on Amazon

Disclosure: As an Amazon Associate, Books of Brilliance earns from qualifying purchases.

What Has Changed From the Book?

A full comparison will require examining the completed series, but the creative team has already discussed several adaptation choices.

In an interview with the Royal Television Society, the team explained that the television version draws on Evans’ South Wales roots, while Day’s novel was set in the Cotswolds.

The birthday celebration also gains a circus theme that Day said was not in her original version. She connected that choice to the contrast between the performers’ freedom and the Fitzmaurice family’s repression.

Solemani also described how getting to know Evans influenced the adaptation’s treatment of Martin, including his religious background and relationship with his mother.

Those choices suggest a production interested in developing Martin’s identity alongside the mystery. They do not establish whether the series changes the novel’s ending.

Why This Adaptation Is Worth Following

For Books of Brilliance readers, the most compelling angle is the relationship between loyalty and belonging. Martin’s attachment to Ben raises an uncomfortable question: when does protecting a friendship become protecting the person who holds power over you?

That makes The Party a useful subject for a future book-versus-series discussion. The setting and visual details matter, but the stronger comparison will examine how each version presents Martin’s dependence, Lucy’s perspective and Ben’s influence.

The premiere offers the first opportunity to see how those tensions translate to television. Readers can begin with Day’s novel, while viewers can meet Martin and Ben through the five-part adaptation.

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