Trigonometry is a love story about three people who are made for each other, written by Duncan Macmillan and Effie Woods in their first joint television project.

Gary Carr (The Deuce, The Good Fight), Ariane Labed (The Lobster, Attenberg) and Thalissa Teixeira (The Musketeers, Press) are to lead the cast. Made by House Productions for BBC Two.

In crowded and expensive London, cash-strapped couple Gemma (Teixeira) and Kieran (Carr) open their small apartment to a third person. Somehow, their new addition, Ray (Labed), makes the flat seem bigger, not smaller. Gradually, many things become easier, nicer and better with an extra pair of hands.

Trigonometry has emotional and psychological truthfulness at its heart. Funny and full of sexual tension, Gemma and Kieran have everything to lose. As this unusual relationship becomes unavoidable, the trio approach it with the prudence of people in their 30s. Is it possible to love in a different way? But even when common sense, friends and family are telling them that this complicated relationship is doomed, Gemma, Kieran and Ray simply can’t be apart...

Further cast include Rebecca Humphries (Big Bad World, Morgana Robinson’s The Agency), Isabella Laughland (Harry Potter And The Deathly Hallows, Lewis), Ambreen Razia (Murdered By My Father) and Anne Consigny (Elle).

Episodes 1-5 will be directed by Athina Tsangari (Chevalier) and Episodes 6-8 will be directed by Stella Corradi (Through The Gates).

Piers Wenger, Controller of BBC Drama, says: "Duncan and Effie’s unique and beautiful scripts demanded three extraordinary, honest and fearless actors to play their leads. And I am delighted that in Gary, Thalissa and Ariane, they have met their sweethearts."

Gary Carr says: “Trigonometry is just one of those special projects. I’m so grateful to be joining this stellar team of artists and creatives to tell this very human story."

Ariane Labed says: "I’m very happy to have the chance to work with Athina Tsangari once again. Her vision, and the tone of these beautiful scripts is going to create something absolutely unique."

Thalissa Teixeira says: "I'm totally overwhelmed by all of it, the scripts, the shoot, the people. I’m so happy to be a part of this exceptionally original story."

House Productions joint CEO’s Tessa Ross and Juliette Howell adds: "We are thrilled that Arianne, Gary and Thalissa have brought the characters in Duncan and Effie’s exquisite scripts to life in such a beautiful way. Working with two hugely talented directors, Athina Tsangari and Stella Corradi, they have given us something very special, creating a thrilling and palpable on screen chemistry which makes this feel truly exceptional."

Trigonometry is produced by House Productions for BBC Two. Executive producers are Duncan Macmillan and Effie Woods; Tessa Ross and Juliette Howell for House Productions and Tommy Bulfin for BBC Two. The series has been commissioned by Piers Wenger, Controller of BBC Drama and Patrick Holland, Controller of BBC Two.

The producer is Imogen Cooper (Hatton Garden, The Windsors) and the transmission date will be announced in due course. BBC Studios will handle distribution for the series.