In 'Call of the Unknown', you find yourself in the shoes of a disgraced private investigator who receives a series of mysterious phone calls from a hidden individual known only as 'V'. Each call unveils a dark secret tied to a string of unsolved disappearances and enigmatic riddles that challenge your wits and deductive skills. You must navigate a series of interconnected stories and choices that span various locations in a bustling city, where your decisions lead to multiple endings. Track down suspects, gather clues, and uncover the truth in a race against time before the calls stop - or worse, before you become the next target.