Critical Mass cover

Critical Mass

Expeditionary Force • Book 10

by Craig Alanson

Narrated by R.C. Bray

4.71 ABR Score (34.3K ratings)
★ 4.52 Goodreads (9.1K) ★ 4.89 Audible (25.2K)
19h 25m Released 2020 Sci-Fi

Why Listen to This Audiobook?

Ten books in and R.C. Bray still sounds like he's genuinely surprised the universe keeps trying to kill everyone — and somehow that never gets old.

  • Great if you want: escalating sci-fi stakes wrapped in relentless banter
  • Listening experience: long, propulsive, and easy to lose hours in
  • Narration: Bray's deadpan timing lands both the jokes and the dread
  • Skip if: you haven't started the series — entry here is brutal

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About This Audiobook

When humanity's ragtag band of interstellar defenders faces their most perilous situation yet, the stakes couldn't be higher. The galaxy's wormhole network has attracted unwanted attention from hostile alien forces, and their growing investigations threaten to expose a direct path to Earth. As enemies close in from multiple directions, the crew must navigate increasingly dangerous waters while protecting the secret that could doom their home planet. What began as humanity's bold venture into the cosmos now teeters on the brink of catastrophic exposure, forcing impossible choices between survival and sacrifice.

R.C. Bray delivers another masterful performance that elevates Alanson's intricate space opera to new heights. His distinctive character voices breathe life into the ensemble cast, from the sardonic AI companion to the battle-hardened human crew members, each rendered with precise emotional nuance. Bray's pacing expertly balances the story's technical exposition with its pulse-pounding action sequences, while his delivery of the series' signature humor provides perfect tension relief. The nearly twenty-hour runtime flies by as Bray's commanding presence transforms complex military science fiction into an immersive audio experience that showcases why this narrator-author pairing has become legendary among genre fans.