Ellie Efron is heartbroken when her best friend suddenly passes away. How can she possibly refuse her friend's last request to take care of her rescue dog, Atlas, so he doesn't end up back at the shelter? Ellie reluctantly agrees but ends up in over her head with the 100-pound, reactive Atlas. Desperate not to let her friend down, she seeks help from an animal behaviorist.

For Hayden Brandt, impermanence is the only constant in life. She's already lost everyone important to her. Instead of dwelling on her losses, she focuses on helping animals overcome traumas so they can live their best lives. Content, she spends her evenings with simple pleasures such as a glass of wine, a good book, and the occasional no-strings hook-up.

Ellie and Hayden's chemistry is instant, though neither is ready to make any promises. But Atlas knows a thing or two about grief, and he just might find a way to give this busy, hopeless romantic and commitment-phobic vet a roadmap to forever.