When former fashion model Maddie Hayes goes broke and finds that one of her few remaining assets is ownership of the Blue Moon Detective Agency, she is tempted to liquidate it until she meets the quirky employees and gets involved in their even quirkier cases.
After an embezzling accountant leaves her penniless, ex-model Maddie Hayes decides to sell the few failing businesses she still owns, among them a detective agency. But private eye David Addison wants to keeps his job, so he persuades a reluctant Maddie to form a partnership. Their first case gives them little to go on: Maddie gets a broken watch from a dying man.
Dave and Maddie face a difficult situation when they have to tell their client that the son he hired them to find is a notorious contract killer.
Maddie believes that a client's design secrets are being pilfered from the astral plane by a psychic.
Maddie becomes infatuated with a radio talk-show host who has apparently been murdered while he was on the air.
Maddie and Dave get trapped on a train filled with mystery buffs when they try to deliver Agnes on time for her big weekend solving a make-believe murder staged by a famous author.
Dave and Maddie find a dead body as they try to collect money for a collection agency, but it disappears without a trace when they try to report it.