Savannah Drake would be thrilled about starting her final year of medical school if it weren't for one thing: she has to spend a month working in the emergency room with cold, aloof Dr. Wesley Kent as her mentor. When her first day in the ER proves to be a humiliating disaster, Savannah is ready to swear off emergency medicine forever. Gradually, though, she finds that the unpredictable, emotional experience of caring for patients in the emergency room is affecting her far differently than she expected - and Dr. Kent turns out to be anything but the arrogant attending physician that she assumed him to be. But just when Savannah finally admits to herself that she is falling for Dr. Kent, she learns that things at the hospital are not all what they seem. Faced with a seemingly impossible choice, Savannah must decide between her future career and everything that she has come to care so much about.

Quinn Meyers is elated to learn she has been accepted into Lakewood Medical Center's emergency medicine residency program. However, having never worked in such a busy, high-acuity ER before, she also worries she'll be in way over her head. With only a few months until medical school concludes and residency begins, Quinn jumps at the chance to sign up for a rotation in Lakewood's ER, hoping to gain some experience prior to residency. She soon sets out on the cross-country drive to Lakewood, and during a detour through Yellowstone, Quinn meets an enigmatic park ranger she can't stop thinking about. Later, when her ER rotation commences, Quinn is stunned to discover the handsome ranger is actually an emergency medicine resident, Dylan Gillespie. As Quinn finds herself increasingly torn between growing feelings for Dylan and lingering wounds from a past broken heart, she must not only determine if she can fit in at Lakewood but what it truly means to be in love.