On a warm summer day in rural Finland, a young boy meets his friend to collect on a dreary promise.

Anu sees Heloisa regularly in her practice, who, whenever falls in love, begins to suffer from cruel and tormenting obsessions towards her beloved. Heloisa's twisted psyche fascinates Anu in ways she does not fully understand - professionally and personally. But one day, Heloisa abruptly stops therapy. A midsummer party with a couple of friends is interrupted when Anu's son Antti arrives with his new girlfriend - who is Heloisa. Anu is forced to confront her own limitations and the painful memories of Heloisa's therapy relationship, which reveal an obsessive bond between them that threatens to destroy everything.