What separates the good teen romances based on young adult novels from the soppy, ridiculous ones? Emotional conviction, mostly, and committed performances. Everything, Everything is mostly one of the good ones, even if it has everything (everything) that makes these movies head south for everyone (everyone) but the target audience of teenage girls.

Jolts of humor and fantasy bring welcome texture to the romance-novel sleekness, as do the leads, who both have an uncommon, idiosyncratic allure.

With a pair of irresistible leads and a straightforward love-overcomes-adversity story, Everything, Everything scores a direct hit on the teenage-girl market. Others might find it pretty enjoyable as well.

The film does have its charms. The outside world, when we do reach it, is as gorgeous for the audience as it must appear to someone seeing it for the first time.

The lead actors are attractive and charismatic and give nuanced performances. Unfortunately, the dialogue they are given to speak is often trite and too many plot strands are unconvincing.