Tess Monaghan is a fictional character created by author Laura Lippman. She is a private investigator based in Baltimore, Maryland, and is known for her sharp wit and keen observational skills. Tess often finds herself entangled in complex mysteries that reflect her personal struggles and relationships. Throughout the series, Tess navigates her career while dealing with the challenges of her past and the dynamics of her friendships. The character first appeared in the novel Baltimore Blues and has since become a central figure in Lippman's works, showcasing themes of identity, loyalty, and the intricacies of urban life.