Colton Cowboy by Carla Cassidy

A note says the infant left on ranch foreman Anders Colton's porch is a Colton and his baby! The beautiful rookie officer who investigates is set on proving herself as a cop, but when their lives are threatened, Elle Gage moves in to protect baby Bonnie. Suddenly the lone wolf is thinking of his family and must uncover little Bonnie's parentage before it's too late.