The Hidden Tunnel — Eva Pohler

It's hard to say no to a handsome billionaire...

Ellen, Sue, and Tanya travel to Portland, Oregon where a local billionaire has promised to give them his current renovation project--a historical carriage house in the downtown area--if they can find his missing brother. As they dig deeper into a local legend, they soon fear that the cause of the brother's disappearance is more sinister and more powerful than ghosts.