SSssshhh, don’t tell my agent.

Ashleigh Hutchinson has always used chemistry to explain the hard-line difference between love and lust. For example, she loves her best friend, Xander. She lusts after the douchebags on her dating app. For three weeks only. It’s a system that works—until her theory starts falling apart.

After getting fired on the last day of school for her one too many sexcapades—with no savings and no job prospects—Xander convinces Ash that participating in a sleep study clinic for cash is the perfect bridge job. She’ll get paid all summer to sleep without sacrificing their long-standing party pact. The catch? The sleep study is only looking for couples. With rent looming, she agrees to fake being in a relationship with Jake—the insomniac who just so happens to be sitting next to Ash at the sleep study —for twelve whole weeks. Jake also happens to be douche.

When they almost get kicked out of the sleep study thanks to the constant fighting, Jake proposes Ash actual date him for twelve weeks. You know, to prove he’s not a douche.

But as Ash starts to spend more time with Jake, the line between friend and lover begins to blur, poking holes in her theory that love and lust can’t coexist. But it’s not Jake she’s thinking about. Ash suddenly has to come to terms with the realization she's been crazy, stupid in love—and lust—with her best friend all along. The only problem is, Xander’s in love with someone else.