Hypnos: The Underworld Saga, Book Seven

Therese doesn't like being stuck on the sidelines, especially when the entire pantheon is in trouble.

 

Hypnos goes to Mount Olympus to offer Zeus a deal. He'll make it his mission to find out the source of the recent attacks on Gaia--horrible earthquakes that have already released two monsters from the Titan Pit--if Zeus will agree to let him and Jen have one immortal child.