Krista Lopez has five days to fulfill her Turning-Thirty Vow-the promise to do something life-changing in celebration of this milestone birthday. Her plan: give in to her attraction to her boss Mr. Blake Ryan. Krista's Irish-American hunk of a boss is conveniently vacationing in the same posh resort in Boracay. When he proposes a one-week affair while they're on vacation, she accepts. It's only a fling, after all. Krista will not fall for an American. She can't. She promised her mother.

Krista and Blake hope what happens in Boracay stays in Boracay. They want to keep their affair a secret from their colleagues, from her family. But, secrets have a way of coming out. When they're found out, will Krista and Blake end their affair or will they say Carpe Diem to the promise of a love of a lifetime?