Bundle of Trouble by Elle James

A mother's hunt for her kidnapped son leads her to a wealthy Texas rancher in this romantic suspense adventure by a New York Times–bestselling author.
Sylvia Michaels had raised her son for four short months before he was cruelly snatched from her arms. Desperate and alone, her investigation led to Texas and the ranch of multimillionaire Tate Vincent. The ruggedly handsome bachelor was an intriguing man . . . and the father of a child who looked suspiciously like hers.
But what was supposed to be a joyous reunion was shattered by a hail of gunfire—and an empty cradle. Now both parents were on the hunt for the kidnappers and the child they each claimed as theirs. Tate couldn't deny that Sylvia fought with a mother's passion, and Sylvia couldn't help but notice that the protective man made the perfect father. But would their dream of a family be shattered before it even began?