Dyson trees, biological skyships, space dreadnoughts, alien greys: the five systems are not big enough for this final adventure! Ravana O'Brien, Detective Ostara Lee, annoying young crew-mate Artorius and their disgruntled sabre-toothed robot are marooned a very long way from home. An extra-dimensional labyrinth of hollow worlds, the lair of ancient omnipotent tricksters, homicidal giant spiders, mysterious alien greys and the insular descendants of lost colonists who believe the Earth is no more.

Priest Taranis is reaping his twisted destiny with a new apprentice at his side. Ravana's father and friends are scouring the five systems and beyond for answers. Space dreadnoughts and incompetent mercenaries are on manoeuvres as the fledging Terran Federation slides towards civil war. In the shadows of a hollow moon, a scheming would-be god prepares the last roll of dice to seal humankind's fate. Can Ravana and crew find their way home and save the day?

Hollow Worlds is the fifth and final book in the 'Hollow Moon' series; space-opera mystery and adventure for all young adults and adults young at heart!