Former med student Wallace (Daniel Radcliffe) is on the brink of swearing off relationships for good. Then he meets Chantry (Zoe Kazan), and it's like the world has new meaning. Chantry has a boyfriend, a boyfriend who's been in her life since about forever, so getting rid of him won't be easy. Wallace commits to being Chantry's partner in crime and the two embark on a journey that will eventually have Chantry asking herself: what happens when you begin to fall for your best friend?
Watch What If on Amazon Prime.