Declan's always been careful to guard his heart, but Isaac's catching up at last. Some things are worth fighting for, even when they're running fast.

Dr. Isaac Paliades has never been much for letting sleeping dogs lie, and he's been intrigued by his colleague Dr. Declan Day from the moment they met. Declan's a hard man to get a read on, one minute cool as snow and the next minute hot-blooded enough to give Isaac a run for his money. Though they work together, play together—and occasionally sleep together—Isaac has yet to get a good look at the man Declan is behind the carefully constructed masks he shows to the world.

But when the pair of physicians rescue an abandoned baby discovered while they're out for a jog, Isaac sees cracks start to appear in Declan's façade. He's taking the care of their foundling more seriously than anyone imagined he would, and bringing Isaac along for the ride. He's asking for dominance in bed, and a deeper friendship at St. Hawk's.

Isaac thinks he's finally found the key to unlocking Declan's guarded heart. But even when the walls come down, can Declan find the courage and will to let Isaac in?