"Doris Force at Locked Gates; Or, Saving a Mysterious Fortune" by Julia K. Duncan is a novel written in the early 20th century. The story revolves around the protagonist, Doris Force, a young girl who finds herself embroiled in mystery and intrigue when she receives an invitation from two sisters to visit their enigmatic home, known as Locked Gates. As she navigates the complexities of family secrets and unexpected encounters, Doris's quest to uncover the truth about her relatives and potential fortunes begins. At the start of the novel, Doris is introduced as an active and ambitious teenager who receives a peculiar letter from the Misses Azalea and Iris Gates, inviting her to their home in Rumson. As Doris shares this news with her friend Marshmallow, they speculate about her newfound family ties, including the possible inheritance. Upon her arrival at Locked Gates, she encounters not only the sisters but also Ronald Trent, whom she learns is supposedly her cousin. The opening chapters build a suspenseful atmosphere with hints of hidden agendas belonging to Ronald and his accomplice, Henry Sully, foreshadowing an unfolding plot that Doris feels compelled to unravel. (This is an automatically generated summary.)