There are 3 books in the The Themis Files series. The newest book is Only Human which came out in 2018.

1
Sleeping Giants

Book cover of Sleeping Giants
A page-turning debut in the tradition of Michael Crichton, World War Z, and The Martian, Sleeping Giants is a thriller fueled by an earthshaking mystery—and a fight to control a gargantuan power.

A girl named Rose is riding her new bike near her home in Deadwood, South Dakota, when she…
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2
Waking Gods

Book cover of Waking Gods

'Reminiscent of The Martian and World War Z' PIERCE BROWN

A twenty-story-tall metallic figure appears in the middle of Regent's Park. The caretakers at London Zoo notice it first at around 4am. The figure, or robot, bears a great resemblance to the UN robot known as Themis . . .…

3
Only Human

Book cover of Only Human

The gripping final instalment in the Sleeping Giants trilogy - perfect for fans of Ready, Player One, The Martian and Transformers.
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We always thought the biggest threat to humanity would come from the outside.

We were wrong . . .

Ten years ago, alien robots descended to Earth killing…