Miss Daphne Beekman is a mystery writer by day, inquiry agent by night. Known for her ability to puzzle out plots, she happily works behind the scenes for the Bleecker Street Inquiry Agency, staying well away from danger. However, when Mr. Herman Henderson arrives on the doorstep of the agency, desperate for someone to investigate numerous attempts on his life, Daphne soon finds herself in the thick of a case she's determined to solve.

Mr. Herman Henderson is also a mystery writer, but unlike the dashing heroes he pens, he prefers living a quiet life, determined to avoid the fate of his adventurous parents, who perished while searching for the Lost City of Gold.

As the list of suspects grows and sinister plots are directed at Daphne, the situation quickly deteriorates, and a revealed secret jeopardizes their newfound affection. Only time will tell if Daphne will be able to regain Herman's trust and save both their lives.