The Maltese islands are tiny yet surprisingly rich in mythical creatures. Civilisations who occupied the Maltese islands weaved these beings in their stories and religious beliefs. Creatures such as the Belliegha (the well-serpent), the Gawgaw (man-beast), demons like the Jinn and the Afrit are among the array of monsters that populate our culture. Many of these have been relegated to fantasy, but, if one is attentive, they can be found in the stories narrated by our elderly, who vividly describe them in their generations-old stories. Mostri follows the story of Frans, a police detective who believes monsters are real and behind many horrific crimes. He has to prove their existence to the force and the police psychiatrist or otherwise he risks ending up off the force and into the asylum.

Following the death of her father, Amanda seeks out her long estranged mother, who at their first meeting confesses to having killed two men in retribution to the assassination of her sister, the popular writer K.Penza back in 1986. Before she knows it, Amanda finds herself drawn into the incumbent darkness that has marred her family history as she tries to come to terms with the scars of the past.

On Christmas Eve, at a residence for senior citizens, Vincent learns a lesson in self forgiveness.

Mr. Bailey has come to a stage in his life where everyone around him has long left him, including his wife. To help shelter him from the pain of reality, he has his dog whom he has a strong bond with. After yet another traumatic event, Mr. Bailey reaches a turning point where he realises that embracing death might be more realistic than fearing it.