I'm sorry, I don't have specific information about that particular episode of 'Crime Patrol' from 22 December 2017. You might try looking for official summaries on the show's website or fan forums.
I don't think it's a common genre. Crime - related stories often focus on the investigation, the criminals, and the justice system. Love stories are mainly about relationships. So, 'crime patrol love story' which mixes these two different aspects is not that common. It might be a new or niche concept.
I'm not sure specifically as it could be a very unique concept. It might be a story that combines elements of crime - like investigations, criminals and the work of a crime patrol unit - with a love story, perhaps between a crime patrol officer and someone they meet during their work.