The Wrath of Poseidon(1997)
(The first book in the Hercules series)
A novel by John Gregory Betancourt
The fabled city of Troy has incurred the mighty anger of Poseidon, god of the seas, who calls forth from the ocean depths a fearsome creature to destroy the city. Only the sacrifice of the beautiful Princess Almacea can lift Poseidon's curse--unless Hercules and his companions can slay the dreaded and unstoppable sea monster!
Used availability for John Gregory Betancourt's The Wrath of Poseidon
May 1997 : USA Paperback
September 2013 : USA, Canada, UK Kindle edition