I read the first installment of the Murderbot a few months back (as an Amazon single), but after reading it, I decided I was going to pony up the £8 for the following 3 books - although probably the most I've spent on a single book, let alone 3 books - absolutely totally worth it. I loved this series.
The series follows Murderbot, a rouge security unit, mostly good at killing but who would rather just watch TV and be left alone. The first book reads easily as a stand alone, and I'd say the second book does too.
The third and fourth pull together all the previous adventures into an overarching story that we see Murderbot learning about itself and struggling with the the concepts of emotions and desires.
In fact, the Murderbot ends with that huge question of: what do you want.
There's so many things I enjoyed about this series: it's a sci-fi that doesn't really require you to understand all the ins and outs of the political systems that exist in the world. I've read a few sci-fi books that really struggle to make the world believable because there's often so much to take in - the Murderbot diaries does this in a way that reads easily and lightly.
The action sequences are really well written and fairly easy to follow - another thing I've struggled with in other books.
Even though we know that the Murderbot is a construct, it exists in a time that emotions can be simulated - and therefore felt - by the Murderbot, which, just like any one of us, they don't relish having to process those emotions, and they'd much rather just shun away and hide away escaping with TV.
Finally the characters are refreshing. As a white man myself, I'm too quick to assume the gender and race of the characters I reading about, Martha Wells does a really good job of keeping me in check, reminding me that Murderbot doesn't have a gender, there's people in the universe that don't identify as one gender, and that not everyone is white. I love this, and I appreciate it in the books I read (in the hope that it shifts my mindset).
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