Halcyon Years by Alastair Reynolds
Posted in Alastair Reynolds, Reading Reviewed, Science Fiction at 12:00 on 21 October 2026
Gollancz, 2025, 330 p. Reviewed for ParSec 15.

Halcyon is a generation starship en route to Vanderdecken’s star. The vast structure’s interior, containing many distinct neighbourhoods, including a large lake, is lit by a Skytube which contains the ship’s neuromimetic core and darkens at ‘night’ to display star configurations. Every so often Halcyon’s apparently serene progress is interrupted by disturbances known as growlers, when its forward shield is impacted by interstellar dust particles and the reverberations are felt throughout the ship. The ship’s social hierarchy is topped by the Urry and DelRosso families, whose behaviour is more or less like that of rival criminal gangs. A notable feature of ship life is the Hibernaculum, a building nicknamed Sleepy Hollow, where, for a price, the personalities of the recent (or not so recent) dead can be stored for later revival in new bodies.
Our viewpoint character is not an Urry nor a DelRosso but rather, one Yuri Alexseyevich Gagarin (yes, that Yuri Gagarin,) emerged from Sleepy Hollow many years ago and complete with memories of that first human journey into space. Yet this illustrious history has not been parlayed into anything like celebrity for Yuri: he is a humble private detective and we first meet him when a surveillance job on a cheating spouse goes wrong.
Then we have a classic film noir/detective story set up. A woman calling herself Ruby Blue and claiming to be from the ship’s Department of Works turns up at Yuri’s office and asks him to investigate two suspicious deaths, those of Julianna DelRosso and Randall Urry, seemingly typical Romeo and Juliet-like star cross’d lovers, reported dead weeks apart. Being from those prominent families, the police are an unsuitable option to probe into their deaths, hence Ruby’s recourse to Yuri.
In all this something begins to nag at the attentive reader – unremarked on by most of Halcyon’s present inhabitants since it is their daily existence – but the technology on display is resolutely low rather than high. The camera destroyed in Yuri’s failed surveillance attempt wasn’t digital (or even something more advanced) but instead contained film. Telephones are restricted to fixed locations, there are printed newspapers, railway lines and tape recorders. How on Earth does this square with the developments required to build a generation starship; or indeed the operation of the Hibernaculum?
Only Yuri’s friend Milvus has suspicions about Halcyon’s situation, that the powers that be are hiding something. He suspects that Halcyon may in fact have stopped in space.
The wounds sustained by Randall Urry, as if he had been blasted by one of the ship’s photon cannon, deployed to ward off anything approaching Halcyon obliquely, suggest the answers lie outside the ship. As Yuri’s subsequent trip outside (in a submarine which doubles as an excursion vehicle) discovers, some of them do, but the real ones are internal and more alarming than Milvus had conceived of: revelations which both explain the true status of Halcyon’s journey and why the technology on board is now so low tech.
Throw in some degraded robots (Yuri forms an attachment to one he names Sputnik and which helps advance the plot,) Ruby Blue’s equally enigmatic sister Ruby Red, cynical but resourceful ex-policeman Lemmy Litz and wronged wife Vedette Apolisi, not to mention the supremely world-weary matriarch of the DelRosso family and we have a collection of characters to savour.
In sum, Halcyon Years is a clever and well-thought-out mash-up of the noir style thriller and SF but one which absolutely depends on its science-fictional content for its resolution.
I’m not so sure Halcyon’s Yuri Gagarin would have spoken with such garbled syntax, though.
The following did not appear in the published review.
Pedant’s corner:- Written in USian. Otherwise; sprung (sprang.) “‘Then I hoped you’ve booked’” (‘Then I hope you’ve booked’,) “‘to let them know you’re on your up’” (‘you’re on your way up’,) “outside of” (just outside; no ‘of’,) “to throw himself in the machinations of a case” (to throw himself into the machinations,) “‘and what makes think Lemmy Litz would’” (and what makes you think.) “He opened and it examined the documents” (He opened it and examined the documents,) “another black car heaved into view” (hove into view,) “pages that referred eyewitness accounts” (that referred to eyewitness accounts,) “and bid them temporary farewell” (bade them,) “the band were tuning up” (the band was tuning up.) “‘I didn’t think it would it help’” (the second ‘it’ is superfluous,) “keeping on automatic on her” (keeping the automatic on her; or, keeping one automatic on her,) “the door sprung out” (sprang out,) “Yuri bid farewell” (bade farewell.)







