
Britney Summers (Larissa Albuquerque) is a hidden villainess from the 2019 Hallmark film, Mystery 101 (airdate January 27, 2019). She is a college student and the ex-girlfriend of Rex Halford, who went missing early in the film.
Britney's first encounter with English professor Amy Winslow regarding Rex's disappearance revealed her past relationship, with Britney also voicing bitterness over Rex's relationship with current girlfriend Lacy Daniels. The missing persons case became a murder case when Rex's body was found, and Lacy was later taken and disappeared as well. However, Lacy was found at a cabin with Josh Green, with Amy and detective Travis Burke locating them.
After the discovery, Lacy revealed that she and Rex were writing a report on the theft of test answers, while revealing that the culprit was none other than Britney. As it turned out, Britney hacked into the math center and stole the test answers, which she was planning to sell. When she found out that Lacy was close to the truth, the evil Britney attempted to scare both her and Rex from the trail by writing the message "Back off" in her purple lipstick, with the message being shown on Lacy's mirror. It was the purple lipstick that revealed Britney as a scheming villainess, leading to Claire Tate (Travis' protege) to go undercover as a student looking to buy test answers from Britney.
After the transaction is made, Amy and Travis appeared and took Britney into custody, with Travis uncovering that Britney's scheme was a motive for Rex and Lacy's disappearances, as well as the former's murder. The villainess stated that she had an alibi for the night of the murder; she was at a sorority house at the time. Though it turned out that she didn't kill Rex, Britney was arrested for her scheme.