The thrilling new horror from this best-selling author . . . - When one of his wife Grace's patients dies in unusual circumstances, stem-cell researcher Nathan suspects that someone else has been attempting the same experiments as him bringing mythical creatures to life only with much more success. But then Grace herself is injured, and Nathan's life spirals into a nightmare as he is faced with an impossible dilemma: lose Grace forever, or breed more mythological beasts, at the cost of countless more human lives . . .