In James Griffiths' delightfully eccentric comedy "The Ballad of Wallis Island," Charles (Tim Key) is the kind of sweet human being you instantly want all the good things for. It might be tough, for instance,

Sian Clifford and Akemnji Ndifornyen round out the cast. “Here We Go” sitcom star Basden and Key co-wrote the feature and also star in the Focus Features release. James Griffiths directs the comedy, which is set on the fictional titular Welsh island.

Mulligan, who plays the role of Nell Mortimer in the upcoming film The Ballad of Wallis Island, revealed she brought her third baby to set after giving birth. “When they sent it to me, I said I'd love to do it, but I will have like a 12-week-old baby,” she tells PEOPLE. “And they were just amazing.”

The snap, crackle and pop of vinyl marks the start of The Ballad of Wallis Island, a music-themed rom-com that’s half-whimsical com and half-unrequited rom. In the absence of a new film by John Carney,

"The Ballad of Wallis Island" resembles a band that continues playing despite the fact that their instruments are clearly out of tune. It's a film that keeps plowing ahead despite exhausting its audience right out of the gate as it tells the story of a lonely man who uses his lottery winnings to try to reunite his favorite band to play a solo show just for him.

Focus Features has set a March 28 limited release for its Sundance Film Festival Premiere, The Ballad of Wallis Island. Pic follows Charles (Tim Key), an eccentric lottery winner who lives alone on a remote island and dreams of getting his favorite musicians,