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 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 . . .