Nancy is an 18-year-old amateur detective living in the town of River Heights. Having recently graduated from high school, she uses her free time, financial independence, and personal vehicle to investigate local mysteries. She holds a strong sense of justice and routinely volunteers to help those in need, frequently putting her personal safety at risk to correct wrongs.

Carson is a prominent, widowed attorney practicing law in River Heights. He respects his daughter's intellect and occasionally enlists her help with delivering legal documents. Rather than attempting to control her actions, he provides professional advice and access to his legal network to assist her investigations.

Josiah is a deceased, wealthy eccentric who accumulated a large fortune over his lifetime. Before his death, he lived with the Topham family but promised financial bequests to various friends and relatives who showed him genuine kindness. Because he decided to draft and hide his own will, his intended heirs are left completely vulnerable.

Ada is the haughty, status-obsessed daughter of the wealthy Topham family. She treats service workers poorly and immediately attempts to shift blame onto others when she damages property. She worries constantly that hidden documents might surface to ruin her comfortable lifestyle.

Isabel is a greedy and self-centered young woman who looks down on anyone she considers socially inferior. Like the rest of her family, she is desperate to secure a massive inheritance to fund her lavish personal tastes and elevated status in River Heights.

Mrs. Topham is an aggressive social climber who invited a wealthy eccentric to live in her home solely to secure his fortune. She is highly protective of her perceived status in town and views charity only as a cynical means to improve her public image.

Mr. Topham is the arrogant patriarch of the Topham family. He suffers from heavy stock market losses behind the scenes and heavily relies on a disputed inheritance to cover his massive debts. He hires aggressive legal representation to enforce his dubious claim on the estate.

Sid is the rough and ruthless ringleader of a gang of burglars targeting seasonal properties around Moon Lake. He prioritizes a quick getaway and financial gain over human life, demonstrating a complete lack of remorse when trapping his victims in confined spaces.

Hannah is the middle-aged housekeeper for the Drew family. She stepped in to help raise the young detective after the death of Carson's wife years ago. She provides a stabilizing, maternal presence in the home and ensures the family maintains a healthy routine between their busy schedules.

Abby is an impoverished elderly woman and the cousin of Josiah Crowley's late wife. She lives in total isolation and struggles to afford basic necessities like food and home care. Her failing memory complicates her ability to communicate clearly, but she holds critical information regarding a hidden notebook.

Judy is an energetic five-year-old girl living with her two great-aunts. She was completely orphaned after her parents died in a tragic boating explosion. Her near-miss with a speeding furniture van directly initiates the investigation into her family's stolen heirlooms.

Edna is a maiden seamstress who took on the heavy responsibility of raising an orphaned relative. She struggles financially on a meager income and had hoped a promised inheritance would secure the young child's future education and care.

Mary is a maiden seamstress who lives with her sister Edna and their young great-niece. She remains absolutely convinced that a later will exists to replace the one favoring the greedy Topham family, but she lacks the resources or physical ability to investigate the matter.

Allison is a young woman struggling to maintain a small agricultural property with her sister after the death of their parents. She possesses a remarkable soprano voice and dreams of becoming a professional opera singer, but she cannot afford the necessary vocal lessons to pursue her career.

Grace is an orphaned young woman desperately trying to keep her family's farm afloat. She is deeply supportive of her sister's musical ambitions and places great hope in the possibility of recovering legal documents that could secure their future.

Fred is an older bachelor who runs a local fruit farm with his brother. Years ago, he hoped to marry Edna Turner, but she declined in order to raise her orphaned relatives. He maintains a quiet agricultural life with lingering dreams of traveling.

William is a bachelor farmer who manages agricultural property with his brother. He previously courted Mary Turner but remained unmarried after she chose to dedicate her life entirely to her orphaned relatives instead.

Henry is a seasoned attorney and an old professional friend of the Drew family. He confirms critical legal information regarding a wealthy client's estate planning, effectively pushing the primary investigation forward.

Helen is a friendly peer who is preparing for a trip to her aunt's summer camp at Moon Lake. Her ticket sales unintentionally provide the perfect excuse for an investigator to visit a hostile family's residence.

Jeff is the caretaker hired to maintain and watch over a wealthy family's summer property. He falls victim to a group of aggressive burglars who trap him on the grounds while they systematically loot the cabin.

Signor Mascagni is a local vocal coach with a keen ear for talent. He is highly impressed by a young farmer's soprano range and expresses a strong desire to take her on as a formal student if she can secure the required funds.