Miranda Clarke, a 15-year-old aspiring musician and self-proclaimed tech nerd, is thrilled when her mother, Lisa, who works as a sound engineer at the iconic Belmont Recording Studio in New York City, invites her to the studio on the day Taylor Swift is set to record her highly anticipated tenth album. Miranda, a die-hard Swiftie, has found solace in Taylor's music ever since her father, James, a talented musician, passed away in a car accident two years ago. As Miranda helps her mother set up for the recording session, she stumbles upon a suspicious figure lurking in the studio halls. When Taylor arrives, she discovers that her precious demo tapes have been stolen, sending the studio into chaos. Sensing Miranda's potential, Taylor enlists her help to track down the thief and recover the demos. The two hatch a plan to involve Taylor's massive fanbase, the Swifties, to gather information and lead them to the culprit. As Miranda and Taylor work together, they form an unexpected bond, sharing personal stories and dreams. With the help of the Swifties, Miranda and Taylor piece together clues and eventually track down the thief to a run-down apartment building on the Lower East Side. In a daring confrontation, Miranda chases down and apprehends the thief, recovering the stolen demos and saving the day. In the aftermath of the incident, Miranda becomes an overnight sensation, hailed as the "Swift Detective" by media outlets and fans alike. However, the real treasure is the friendship she has formed with her idol, Taylor Swift. When Taylor's new album is released, Miranda is shocked and touched to discover a song dedicated to her, cementing their bond and celebrating the power of friendship and resilience.