Joshua Mason is an everyday man cursed with immortality.

"Borrowed Time soothed my aching heart in many ways. It made me think about the things that really matter in life and the things that don't. It made me think about true love, about finding one person to spend your life with--something that has always eluded me. And it made me think about death, about why we need to believe there is a hereafter because, without it, life becomes unbearable." --Sasha Stone, Free Thinking Through the Fourth Turning

Joshua Mason has been alive for thousands of years. He doesn't know how or why it happened, only that he can die like any man, but will always return.

When you live forever, everything you love will die, so he decided long ago to not become attached. That all changed when he met Doreen. With her, he found something more than the woman he loves, after thousands of years of wandering, he found his place in the world. Now she's dying of old age. Distraught, Joshua promises to look after Charlie, Doreen's grandson, who is thirty-six, but forever a child due to a terrible brain injury.

Keeping Charlie safe means making money to keep Charlie's world--a crumbling motel in the middle of a barren desert--afloat. Mason makes this money by selling his life on the dark web to wealthy people who enjoy the ritual of murdering him.

And now, when Mason only wants to mourn the loss of his wife, he discovers he sold his life to some very dangerous people and that Charlie is not as innocent as he seems.