You can also read this review on my blog 
 In short: Catalyst by S.J. Kincaid is a fantastic finale to a very entertaining trilogy. 
 And so ends another much beloved series. I've been anticipating the ending to this high-action, high-stakes dystopian sci-fi for a while now - and thankfully this finale doesn't disappoint! The Insignia Trilogy follows gamer Tom Raines who, upon being recruited by the Pentagon and having a chip implanted in his head, can control fighter ships remotely in space as part of an intrasolar World War III. It's Ender's Game for a new generation and it's AWESOME. 
 Catalyst is the darkest book yet in this trilogy - the stakes are at their highest and the plot is at its most perilous. S.J. Kincaid takes risks and introduces twists and I have to applaud her for them as that's exactly what I want and NEED to see in a finale to a series like this. This series is also memorable to me because of the many moments of hilarity it induced while reading - and while Catalyst is the darkest and least playful of the trilogy, there was still some room for S.J. Kincaid's brilliant humour and I welcomed that. 
 As with Insignia and Vortex, I will say that the plot reaches almost ridiculous levels - complexity-wise and plausibility-wise - in Catalyst. The reliance on technologically-related plots sometimes goes over my head, while the political inferences are sometimes a bit on the nose. This series isn't about subtlety, it's about that entertainment factor and it definitely delivers on that. I will be sad to say goodbye to the greatest friends Tom, Vik, Wyatt, and Yuri, but I am pleased at least that Catalyst was a satisfying ending to an exciting series.