
2 Sisters Detective Agency
thriller
Series · science fiction thriller
The Zoo series by James Patterson has 2 books and is best read in publication order, starting with Zoo (2012).
Start here: Zoo (2012) — then read straight through in publication order.

The order the books were released — the default way to read the series.
Young biologist Jackson Oz watches animal behavior turn violently, coordinated and inexplicably aggressive worldwide -- lion ambushes in Africa, swarming attacks in cities -- and races to convince world governments of a threat they'd rather dismiss. James Patterson and Michael Ledwidge built Zoo (2012) as a high-concept eco-thriller in the mold of a disaster movie, and it became one that literally became one: a three-season CBS television adaptation followed.
Zoo 2 (2016), a shorter follow-up written with Max DiLallo, continues the story past the original novel's ending.
Read Zoo (2012) first -- it's the full-length novel that sets up the global animal-attack premise and Jackson Oz's fight to be believed. Zoo 2 (2016) is a shorter continuation for readers who want to know what happens next; it's optional rather than essential; the first book tells a complete story on its own.
Two: Zoo (2012) and the shorter follow-up Zoo 2 (2016).
Zoo first -- it's the complete original novel. Zoo 2 is an optional continuation.
The novel inspired a three-season CBS television series (2015-2017), but the show developed its own storylines separate from the books.
Zoo was co-written with Michael Ledwidge; Zoo 2 was co-written with Max DiLallo.
No further title had been announced as of this writing.
Reading order last verified .