For years, they have worked in secret, patiently waiting in the shadows...Now, they have decided to begin the next phase of their plan - a plan that threatens the very nature of human kind. Caleb, a US Marine on leave, is staying with his long-time partner, Darcy. One morning, Darcy receives an email from one of her colleagues. Caleb sees something embedded in the attachments - a file that he recognises from one of his missions. With his work in the military, discovery of the program can only mean one thing - that he and Darcy and in danger.Now that his working and personal lives have overlapped, Caleb must rely on all his training and instincts if he is to keep himself and Darcy alive...Nightfall is the first in a series that examines the nature of the human condition, asking the question - How can you tell black from white, when all that exists are various shades of grey?Nightfall is Peter's debut novel."Nightfall is an exciting action / adventure that covers the Western United States and regional Australia. I hope you enjoy reading it as much as I did writing it."