"August" was probably my favorite book in the series so far! It was more suspense than action.
We end "July" with Cal being buried alive.
In order to save Cal's life, Boges and Winter call the police to help dig up graves to find Cal, so Cal wakes up in a hospital, handcuffed to a bed, at the beginning of "August". When the cops come to talk to Cal, Cal learns that someone kidnapped his sister Gabbi (who is in a coma BTW) and the police, his mom, and uncle Rafe all think CAL is the one who kidnapped his sister so he could "finish the job". (HOW they think a sixteen-year-old fugitive is going to kidnap his sister in a coma and hide her is beyond me.)
Cal is able to escape from the hospital by climbing through the ceiling. He uses an old man sleeping in a wheelchair to walk out the front door, but one of Oriana's men spot him and a chase peruses! Just as he's about to get caught, ex-detective Sharkey shows up to save the day and whisk Cal away in his truck!
The rest of "August" is about Cal and his friends trying to track down who has Gabbi and how to get her back. When Cal tracks down who has her, Cal offers the kidnappers all of his notes and himself if they promise to release Gabbi. During the exchange, Boges and Sharkey are supposed to swoop in and rescue Cal and Gabbi, allowing them to get away but things go awry and one of the kidnappers throws Gabbi's unconscious body into the raging river below the bridge they all met on for the exchange! Cal immediately jumps into the river after his sister, hoping to get to her before she drowns, but all Cal finds is the empty sleeping bag Gabbi was wrapped in, with Gabbi nowhere in sight.
"August" ends with Cal laying on the bank of the river mourning the loss of his little sister.