Seleptium by Ryen Moormann

Cain Stevens is a scientist on the verge of a breakthrough that could change the world. Just when things start going his way, he starts receiving a message (You will pay for what you have done!) While trying to figure out who is sending the message, his wife and children are kidnapped. When he thinks things can't get any worse, the kidnapper ask for a ransom that will change his life forever.