In the 1940s, private detective Rigby Reardon is approached by the alluring Juliet Forrest to investigate the mysterious death of her father, renowned scientist Dr. John Forrest. Her father's last words suggested foul play, and she hands Rigby a list of names that she found in her father's belongings. Eager to uncover the truth, Rigby embarks on a convoluted quest that takes him deep into the underbelly of espionage and dark secrets. In classic noir style, Rigby navigates a world rife with femme fatales, dangerous villains, and shadowy intrigue. His pursuit leads him to spontaneously interact with various characters through cleverly interwoven clips from classic black-and-white films, infusing a sense of humor into his unusual investigation.

Soon, Rigby discovers that Dr. Forrest's research is being sought after by nefarious conspirators with plans that could threaten the balance of power worldwide. As he delves deeper into the case, Rigby encounters a rogues’ gallery of characters, ranging from suspicious collaborators to criminal masterminds. The investigation becomes perilous as he realizes that solving this case means putting his life on the line. With each bizarre clue and convoluted twist, Rigby grows closer to unraveling the conspiracy behind Dr. Forrest's death. Along the way, he must trust his instincts and charisma to navigate through chaos in his efforts to expose the truth without falling prey to the sinister forces at play. The past and present collide in an adventure filled with danger, comedy, and deception.