Book excerpt: A snowbound reunion! Tension between Dr. Ella Lockwood and former navy doc Zac Davenport is sky-high! All she can think about is how he once broke her vulnerable heart. But now she’s a confident ER surgeon who’ll never let him hurt her again. And being snowed in together on Christmas Eve at Manhattan Mercy reveals his last tour of duty has changed Zac, too. But that compelling spark is still there—and one more irresistible kiss is all it takes to start healing the wounds that have held them back…