Sarah Gailey 
Know Your Station #4 [PDF ebook] 

Paranoia among billionaires is rising almost as high as their profits while they tighten up on security, but they may no longer be the only targets, as Elise discovers some shocking evidence in her search for the killer. After witnessing the most gruesome murder yet, Elise is on the verge of a breakthrough in the case before another panic button blares and she’s greeted by a familiar voice.