Written by Lindsey Beer, the film puts a teen spin on Cyrano de Bergerac. Purser is Sierra, a whip-smart and ambitious teen who's (seemingly) comfortable in her skin, especially compared to the selfie-taking girls around her. The title is clearly off base. Sierra is anything but a loser, even if she chooses to just blend into the background of the high school social scene, hanging with her best friend (RJ Cyler). It seems the only people who see her as such are a trio of mean girls led by the particularly nasty Veronica (Kristine Froseth). The plot really starts churning when Veronica is approached at a diner by a cute boy from another school, Jamey (Centineo). She immediately deems him unworthy because his friends don't seem cool enough. "Only losers hang out with losers," she quips. So, as a prank, she hands him Sierra's number.
Little does she know she just played matchmaker. Jamey and Sierra strike up an adorable text relationship, only hampered by the fact that Jamey thinks he's talking to Veronica. That segues into selfies and, eventually, Sierra realizes she needs to enlist her nemesis in order to continue chatting with her crush. So she offers her a deal. She'll tutor Veronica -- helping her impress the college dude she's pining after -- in exchange for Veronica's participation in her scheme. It's catfishing for mutual benefit.
From there, the movie shifts from being about courtship to being about friendship. In a fairly predictable revelation, Veronica turns out to be saddled with her own issues and a tyrannical pageant mother (This Is Us star Chrissy Metz). With Sierra, Veronica loses her bitchy outer shell, and the two young actors project the bubbly, giggly intoxication of new friendship.