Getting Your Head Around the Alex Rider Series
The Gatekeepers is the sixth novel in Anthony Horowitz's Alex Rider series, and Oblivion is the seventh. They follow each other pretty closely in terms of story continuity, so if you pick one up without reading the others first, you're going to be confused about half the plot. I've seen it happen. There's a bit of a numbering confusion out there, because some people count differently depending on whether they include spin-offs or standalone books. The Gatekeepers was published in 2019, Oblivion followed in 2022. Both are published by Walker Books in the UK and Philomel/Penguin Young Readers in the US. The books aren't especially difficult to track down secondhand if you're on a budget, but new copies are fairly widely available online. What actually happens in these two books is worth understanding before you buy. The Gatekeepers deals with a group of young people recruited into a secret service program, and Alex Rider gets pulled into investigating it. Oblivion is a prequel of sorts, set before the main series timeline, following a different character named Daniel in the 1970s. If you want the full picture, reading them in publication order makes more sense than chronological order.
Where to Actually Get the Books
I went through this process about three times when I was building my own collection. The usual suspects work fine. Amazon, Book Depository (when it was still running), Waterstones, and the big secondhand platforms like AbeBooks and ThriftBooks. The thing most people miss is that paperback editions exist and they're significantly cheaper. The hardcovers are nice for keeping but you're paying a premium for nothing much different inside. If you're after ebooks, Kindle and Apple Books both carry them. Audiobooks are narrated by James Wilson and available through Audible. The audiobook versions are genuinely solid, but there's a downside. You lose the ability to quickly flip back to check a detail or re-read a passage you missed, and that matters more than you'd think with Horowitz's plotting style.
Common Mistakes People Make
The first mistake is buying the wrong edition. The US and UK editions have different cover art and sometimes slightly different introductions, but the actual text is identical. Don't waste money on a special illustrated edition unless you're collecting physically. The regular paperback will serve you just as well. The second mistake is jumping straight into The Gatekeepers or Oblivion without reading the earlier books. I tried this once. I started with The Gatekeepers because I wanted to know if the series was worth investing time in. By page forty I was lost about half the character relationships and completely unfamiliar with how MI6's youth division worked. Horowitz assumes you already know the backstory from the previous five books. It's not rude, it's just efficient writing, but it leaves newcomers stranded. There's a third issue that catches people out. Some retailers list Oblivion under different titles depending on the region. If you're searching and coming up empty, try checking both the UK and US catalogues separately. The ISBNs differ between markets. Knowing the ISBN saves you about ten minutes of browsing at minimum.
Get the Full Details
What the Books Actually Deliver
Horowitz writes spy fiction aimed at younger readers, but the material isn't written down to its audience. The technical details about surveillance tradecraft, cryptography basics, and operational security are accurate enough that adults find them engaging. The pacing moves fast, sometimes too fast for readers who prefer atmospheric tension, but if you like plot-driven narratives with frequent action sequences, the books deliver consistently. The Gatekeepers introduces the concept of a rival intelligence program targeting teenagers, which expands the series universe beyond just Alex Rider as a lone operative. It sets up several threads that Oblivion doesn't directly continue, since that book operates in a different timeline. Both books reference the same fictional organisation and ideology, but they tell separate stories. Reading them back to back works, but don't expect a direct narrative handoff.
The Realistic Downsides
Horowitz has a habit of resolving major plot threads in the final chapters. Sometimes he resolves them so quickly that the last fifty pages feel rushed compared to the rest of the book. This isn't unique to these two volumes, it's a pattern across the series. If you care about tight, economical endings, you might find the conclusions a bit loose. The character development is functional rather than deep. Alex Rider is a vehicle for the plot, and the supporting cast serves the same purpose. Readers who prioritize emotional depth over plot mechanics will find these books thin in that department. That's not a flaw in execution, it's just the genre convention Horowitz is working within. If you're looking for something more mature in tone or more complex in structure, there are better options. John le Carré's works exist if you want spy fiction with literary ambition. But if you want competent, well-researched, fast-paced juvenile spy fiction that doesn't insult the reader's intelligence, Horowitz's output is one of the better catalogs available. The Gatekeepers and Oblivion are solid entries, even if they aren't his absolute best work.
