We all know Sam Mendes for his serious dramas like American Beauty and Road to Perdition, but he’s making an outing into romantic comedy for this next movie. He’s already got a promising cast with John Krasinki and Maya Rudolph as the leads, and now the ever-classy Toni Collette is also on board. Call me crazy, but I think this could be Mendes’ best movie yet.

The Hollywood Reporter writes that Collette will play a college professor and family friend of the couple played by Krasinski and Rudolph (oh, what attractive and funny babies those would be!) The pair is traveling the country in search of a place to settle down and raise their child, but Collette’s character is convinced that, no matter what they do, they’re doomed. Nice to have supportive friends, right?

Most importantly, the screenplay is written by everyone’s favorite indie media mogul Dave Eggers (he wrote A Heartbreaking Work of Staggering Genius and publishes the magazine McSweeney’s), and his wife, Vendela Vida, who is also a novelist. There’s no telling just how autobiographical the story is, but if it is based on their lives, think of how great the casting is. John Krasinski is universally beloved and can pretty much do no wrong, even in a movie as lame as Leatherheads. And Maya Rudolph has had a baby with an indie darling in real life, with Paul Thomas Anderson, so playing Eggers’ fake wife is no stretch!

But, seriously, this movie sounds great, and Collette joining the cast is only even better news. If Mendes’ wife Kate Winslet hops on board in even a small role, I think this project might be my dream come true. You hear that, Kate?