
2 Sisters Detective Agency
thriller
Series · thriller
The Invisible series by James Patterson has 2 books and is best read in publication order, starting with Invisible (2014).
Start here: Invisible (2014) — then read straight through in publication order.

The order the books were released — the default way to read the series.
Emmy Dockery is an FBI analyst obsessed with a theory nobody else believes: that a string of unrelated house fires across the country, each ruled accidental, are actually the work of a single, meticulous serial killer. Sidelined and largely ignored by her own bureau, she keeps building the case alone -- a premise James Patterson and attorney-novelist David Ellis use to drive a slow-burn conspiracy thriller about institutional dismissal as much as the killer himself.
Invisible (2014) sets up Emmy's theory and her fight to be taken seriously; Unsolved (2019) picks the case back up with new fires and new stakes. The two-book series is a complete arc centered on Emmy's persistence rather than an ongoing franchise.
Read Invisible (2014) first to see Emmy Dockery build her case from scratch against institutional skepticism. Unsolved (2019) continues directly from events in the first book, so reading in order avoids spoiling the earlier novel's resolution.
Two: Invisible (2014) and Unsolved (2019).
Invisible first, then Unsolved -- the second book continues directly from the first.
No -- it's a complete two-book arc with no further entries announced since 2019.
Emmy Dockery, an FBI analyst convinced a series of house fires across the US are the work of one undetected serial killer.
James Patterson co-writes with attorney and novelist David Ellis, who also co-writes Patterson's Billy Harney series.
Reading order last verified .