Samuel Kingsley swore off the beach forever. Last summer, his best friend Theo drowned in front of him. He couldn't save him. He couldn't even reach him.

A year later, a coworker returns from Miami with vacation photos. In one of them, Samuel sees something that stops his heart: Theo. Alive. On the beach. Standing in the water.

That night, Samuel's phone lights up with a text from Theo's old number.

"Samuel, I'm back. See U soon."

Now Samuel must return to the place he swore he'd never go — because the tide always comes back. And this time, it's bringing something with it.