More like Leviathan: Leviathan; Behemoth; Goliath

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The Leviathan TrilogySeries
series3 books2009
Steampunk and alternate history, adventurous in tone, about war and genetic engineering, set in europe and early 20th century.
“Set in an alternate First World War, Leviathan splits the belligerents into Clankers, who fight with mechanical walkers, and Darwinists, who fight with fabricated living creatures built from spliced DNA.”
from the catalogue
Start with Leviathan →
The Dragonfly PoolNovel
Eva Ibbotsonstandalone novel2008
Adventure and historical fiction.
Moorcock's MultiverseUniverse
universe102 books1961
Set in secondary world.
“The Multiverse is not one world but an endless lattice of them, worlds folded within worlds, each a variation on the last — and through every one of them walks a single conscripted soul.”
from the catalogue
Start with Elric of Melniboné →
includes Oswald Bastable, Eternal Champion, Hawkmoon, Corum, Warrior of Mars, The Elric Saga
The SeparationNovel
Christopher Prieststandalone novel2002
Mysterious and reflective in tone, about identity, set in british isles.
“The author introduces a deliberate confusion by giving these brothers identical initials – J.L. Sawyer – one known as Jack and the other as Joe.”
from the catalogue
Dawn of FearNovel
Susan Cooperstandalone novel1970
Historical fiction, dark and reflective in tone, set in british isles.
Red Inferno: 1945Novel
Robert Conroystandalone novel2010
War & military, tense in tone, about political intrigue.