Marrow

A select crew accepts the dangerous mission to explore a planet hidden in a massive spaceship in this space opera adventure by a New York Times bestseller.
” Marrow is magnificent. It combines epic sweep with living characters and a depth of vision that we see all too seldom.” —Jack McDevitt
The Ship has roamed the universe for longer than any of the immortal crew can recall, its true purpose and origins unknown. It is larger than many planets, housing thousands of alien races and just as many secrets.
Now one of those secrets has been discovered: at the center of the Ship is . . . a planet. Marrow. But when a team of the Ship’s best and brightest are sent down to investigate, will they unlock the secrets of its creation—or will they be destroyed by the forces that have hidden Marrow for millennia and bring doom to everyone on board?
Hugo and Nebula Award–nominated author Robert Reed spins an extraordinary epic of adventure and wonder on an incredible scale in this novel based on his acclaimed novella.
“A bold work by a visionary writer.” —David Brin
“With Marrow, Robert Reed has written a space opera for the new century, an interstellar opus as mind-boggling as the vast starship he elegantly depicts. E. E. “Doc” Smith has found his successor.” —Allen Steele
“With his command of prose, characterization, and ideas, Robert Reed is the new century’s most compelling SF voice. Marrow is the highest of high concepts, one of the most original visions in a long while.” —Stephen Baxter