What if? revolves around Wallace (Daniel Radcliffe) and Chantry (Zoe Kazan), two devoted friends who cannot admit to themselves -- let alone each other -- that they have romantic feelings for one another. At the start of the picture, Wallace is a recluse who hasn't ventured outside nor spoken to anyone other than best-friend Allan (Adam Driver) in months. Despite being a promising medical school student, he opted to bail on the program after catching his girlfriend and fellow classmate Megan (Sarah Gadon) having sex with one of their professors.

Deeply concerned for Wallace, Allan wants him to at least make a daily attempt at trying to and meet other people. It comes as no surprise that Wallace wants nothing to do with Allan's latest invite to his house party. Although a reluctant Wallace finds himself strong-armed into attending, he cannot relate to anyone there and eventually blends into his surroundings. He slinks into the kitchen where the refrigerator door catches his eye. Why? Because posted on that door are Allan’s words and letters affixed to magnets to create several humorous observations for the amusement of guests. Wallace begins to maneuver the magnets around to craft his own witty paragraph. This captures the attention of Allan's cousin Chantry.

After introducing herself, she spends the rest of the evening getting to know Wallace. She hands him a piece of paper after the party with a caricature of herself and her telephone number. However, Chantry has one unbreakable rule. She only wants to be friends and nothing more. Her fiance Ben (Rafe Spall) simply wouldn't approve of another male around especially if he suspects that person might have ulterior motives about his girlfriend.

Wallace later climbs atop his roof while clutching the paper Chantry gave him. He eventually releases it from his grasp and allows it to be carried away in the wind rather than following up with her. Months later, Wallace bumps into Chantry again -- this time at movie theater. They both came to the movies alone and agree to have dinner afterward. This second chance meeting sparks a close friendship that eventually evolves into being close confidants.

As they become closer and closer, Wallace and Chantry begin to suppress feelings they start having for one another despite their chemistry. Chantry has been asking herself for quite some time whether she should break off her relationship with Ben. It just isn't working now that that he is constantly in demands as a specialist in copyright law and always seems to be in another location each month.

Regarding the cast members, I enjoyed Adam Driver's performance as Allan, a bit of a chameleon who is supportive of Wallace and Chantry one moment and an enormous jerk the next. Plus, Kazan and Radcliffe project terrific chemistry on screen . I bought each of their performances from the start and yearned for their characters to finally get together.

Elan Mastai's screenplay comes across as consistenty funny. His characters are quirky and their situation seems easy to relate to. What If? also benefits from Michael Dowse's brisk pace and deft direction.

Incidentally, the title of this film was abruptly changed  from The F Word to What If? for U.S audiences only. The MPAA felt the title was too provocative. They wanted to slap it with an “R” rating, which without the title change would have drastically limited who could see the film in theaters.

(Released by CBS Films and rated “PG-13” for sexual content including references throughout, partial nudity and language)