“Love is a fire. But whether it is going to warm your heart or burn your house down, you can never tell.” -Joan Crawford Dr. Katy Malone has sworn off love after losing those she loves most in her life including her father, a member of the FDNY. She has decided to spend her time focusing on her medical research. Her ex-fiancée, and fellow doctor, isn't ready to give up on loving her though. Firefighter Nick Garrity is on a search for the future Mrs. Garrity. As he pushes thirty, with no prospects in sight, he's afraid he'll never find her. A devoted member of FDNY, he loves the thrill of his job and the satisfaction it brings him. He strives to teach the proby firefighter, Patrick Doyle, the ropes and pass on his passion to him. When Doyle tries to impress the guys on the crew, he ends up in the care of Dr. Katy Malone. One look at Dr. Malone and Nick knows he's found his future wife but can he convince her to love again?

“In everyone’s life, at some time, our inner fire goes out. It is then burst into flame by an encounter with another human being. We should all be thankful for those people who rekindle the inner spirit.” -Albert Schweitzer For Dr. Katy Garrity, life is a whirlwind, and the New York Fire Department is the heart of the storm. After claiming so many people she loved, including her own husband, Katy is left adrift, trying to keep up with a busy career, a baby son, and her loving extended family. Her only anchor is Jesse O'Neil, her late husband's best friend. The charming former playboy has put his entire life on hold to care for Katy and her son. It's inevitable that sparks will flare between them, but all of life seems to be conspiring to keep them apart. Especially Katy's own heart, which shies away from trusting another firefighter. Will the flames of passion burst into a lifetime of love? Or will secrets burn away their connection, causing Dr. Garrity to be burned again?

New to FDNY Engine 58, proby Paul Jefferson has no idea the expectations that the firefighters before him have set. He walks into his new job with an arrogance that’s sure to land him proby duty for the rest of his days but he has the professional skills to back his attitude. Loving every minute of his time with fire, Paul struggles to find his place in the FDNY brotherhood. Outside of the station, a true playboy at heart, he has no issues making connections, but there’s only one girl that holds his heart. Paramedic Mariana Barbosa is new to the big city. Luckily, her path crosses with Paul Jefferson shortly after accepting her new position. The two instantly connect and become the best of roommates... or something like that. Behind closed doors, the two are the perfect couple without crossing any lines because Mariana is too afraid to risk their living situation to pursue what her heart is telling her she feels. When Mariana feels betrayed by Paul, she jumps on the opportunity to date the handsome, good guy from work. Paul isn’t a fan of Mariana’s new boyfriend and starts to slack with Engine 58. Things don’t go as expected with Mariana’s new boyfriend and after she uses Paul to cover her issues, she pushes him further away until it may be too late for either of them to admit their true feelings.