The Detective’s Brother - The Blackthorn Detective Agency, #1

When tragedy befalls the only female detective in the Blackthorn Agency, it falls to Simon Creed to fulfill her dying wish of finding her half-brother, Quinn Donohue. Upon learning his whereabouts in the mountains of Colorado, Creed invites him to Texas to claim his sister's estate.  Quinn Donohue isn't a man at all, much to Simon's chagrin. But she is able to convince him to let her fill her sister's shoes at the agency.
It doesn't take long for Creed to discover Quinn's secret, but she has a long way to go before she discovers his. Quinn taking a bullet to save Creed's life makes the two acknowledge the feelings each has for the other, but can they solve the mystery of who is trying to kill Creed before they are torn apart forever?