Tyranny by Gemma Brocato

Immortal librarian Clio has existed for thousands of years. Her purpose—to influence and inspire mortals. Now as one has inspired her, a battle is mounting between the Muses and a god who care little for the plight of man. A hostile takeover is imminent at Olympus Enterprises. History professor Jax Callahan is battling his own uncertainties. His previous employer’s refusal to heed his warnings results in a tragic loss of life.

Blaming himself, he no longer believes he can make a difference. Tyranny will stop at nothing to appease her father and succeed in taking over Olympus and the world. To save mankind, Clio must reveal herself as a Muse to Jax, the man she’s fallen in love with. Facing the end of humanity as they know it, she must convince him to trust in the magic of what if. Because failure spells doom for everyone.