The reluctant private investigator in Colourblind is a former police officer named Billie (played by Danielle Macdonald), who is struggling to make ends meet and dealing with personal issues. She is approached by the wealthy father of a young woman named Nina who he believes is suicidal and has gone missing. The father wants Billie to find Nina and bring her back home safely.
Initially reluctant to take on the case, Billie is eventually convinced due to her own troubled past. As she begins to investigate, she discovers that Nina had been living a double life, and her disappearance is linked to a dangerous group of people.
As Billie delves deeper into the case, she becomes increasingly invested in finding Nina and uncovering the truth behind her disappearance. Along the way, she has to navigate the murky waters of the criminal underworld and face personal demons that threaten to derail her mission.
Colourblind is a gritty and suspenseful film that explores complex themes such as mental health, trauma, and justice. It features strong performances from its lead actors and a nuanced portrayal of a flawed protagonist who must confront her own limitations and fears to succeed in her mission.