When David's brother Richard shows up, he does not only seem to be a rich man, but also makes an impression on Maddie. While David has got to handle his jealousy, Maddie has trouble to pay back her $37 000 debt to the bank. When David is attacked by a stranger, who wants back his money, David realizes that all the money that his brother spends does not belong to him.
A mysterious woman appears in Maddie's and David's agency, who does not want to show her face. She wants Maddie and David to find her former lover, who is the reason why she can't show her face. The two detectives find this man, but find out on the next day that someone murdered him. Of course, the mysterious woman is their very first suspect.
Maddie learns where the accountant who took her money is and is determined to get it back, David tries to talk some sense into her, telling her he is in South America so her money is gone. She won't listen and hopes a plane, she imagines him feeling guilty and apologizing instead he maneuvers he out, and just when she thinks all hope is lost David shows up. With him they win, but if they won some other poor sucker lost, Maddie want's him to be the poor sucker. They get him in a little one on one, $100,000 to start Maddie puts up her house and car. When it comes to the…
When David and Maddie meet the owner of a club who tells them about an unresolved murder. Maddie and David argue about who they think the real murderer is and, in their dreams, set about solving the murder that occurred 40 years ago.
A wealthy woman comes to David and Maddie when her son is kidnapped. They are hired to negotiate the price of the ransom and to get her stepson back safely. Things are further complicated when the stepson is kidnapped a second time.
Maddie is hired to find a silver locket by an old girlfriend of David's. He has strong feelings for her and thinks that her husband is trying to kill her. However, Maddie isn't so sure, especially when she kills her husband in self-defense.
An Irish girl who claims to be a leprechaun wants to hire the Blue moon detective agency to protect her. David is willing to take the case, but Maddie thinks that the girl is mentally ill and needs a psychiatrist, not a detective agency.
An artist, whom Maddie has never met, paints her portrait and then shoots himself. Maddie decides to purchase the portrait and gives it to the artist's brother, who is then killed. It turns out the brother was an international art thief.
A rival detective agency has made an offer for Blue Moon Detective Agency and Maddie accepts the offer. Addison is upset and sets up his own agency. Neither courses of action work out well.
A criminal in the witness protection scheme is killed but his wife and baby manage to escape. When fleeing, the baby is left in Agnes' apartment but without any explanation. Maddie and Addison decide to try to find the mother.
A wealthy man comes into the agency wanting to get married. He has a description of his perfect wife but he just hasn't found her yet. Maddie and Addison then compete to find the woman who matches the description, but there's a twist.
Agnes is feeling down and feels that her life is in a rut. To cheer her up, Maddie and Addison decide to send her to an investigator's ball where she meets a man. When he is stabbed the next day, her troubles have only just begun.
An escape artist is drowned when he fails to exit his trick water cabinet. His widow approaches the Blue Moon agency asking for protection. Her husband had threatened to come back and kill her after his death.
Maddie's parents are in town but her mother is worried that her father is having an affair. Maddie wants to follow her father to prove that he is not having an affair. To spare her possible embarrassment, Addison does it for her.
A man dying from an incurable disease comes into the agency. He says he is going to be murdered for the insurance and he wants Maddie and Addison to be a witnesses. Maddie doesn't want anything to do with it but Addison wants to do it.
A prostitute speaks to Addison about a potential murder that she heard about from one of her clients who talks in his sleep. After he realises that the information is accurate, Addison decides to use her to solve more cases.
A man's wife is killed in a car accident, which leaves him so upset he wants to die. He arranges to have himself killed by a hit man. From the distance he sees his wife in the street and so he then hires Maddie and Addison to stop the hit.
When a con woman escapes from the custody of a crooked detective she accidentally stops an assassin killing an American senator. Addison has the bright idea of employing Camille to raise the profile of the company.