Divorced and living with her teenage daughter, Lucía asks her close friend Ana to house-sit and look after her daugh­ter while she goes away with her new partner. Ana spends her days lazing by the pool, afflicted by a deep loneliness until Ricki, Lucía’s ex-husband comes to pick up his daughter and an affair that will have profound implications on her friendship with Lucía begins. Ana and Ricki throw themselves into an intense romance that lasts until the day Lucía comes back… An honest and poignant commen­tary on friendship, I Thought it was a Party is also a film about the search for love, loneliness, fear, guilt, and the world of women.