The movie is based on the bestselling 2012 novel of the same name, written by author John Greene. Like the book, the movie focuses on Hazel and Gus, described as "two extraordinary teenagers who share an acerbic wit, a disdain for the conventional, and a love that sweeps them - and us - on an unforgettable journey. Their relationship is all the more miraculous, given that they met and fell in love at a cancer support group," according to a press release. Shailene Woodley (The Descendants) and Ansel Elgort (Divergent) portray the couple.

"Let Me In" features the standard trading-off of lead vocals between Hannah Hooper and Christian Zucconi. A mid-tempo rocker, the song includes plenty of soft-then-loud, loud-then-soft moments, complemented by formidable guitars and the occasional whirring synth.

"Let Me In" is the first new song from Grouplove since the release of the band's second album, Spreading Rumours, which features the hit single "Ways to Go".