Flashover

It takes four days to find the charred body of Joe Humphrey, an accomplished arsonist, in the burned out building. His SUV is parked out front with gas cans in it. His body is found without keys to his car or his wallet.
Investigators work to determine if Humphrey acted alone or was set up.
The owner of the building is suspect from the very beginning. He despises the lead investigator, Carly Crinshaw, and does everything possible to stop her investigation, from kidnapping to murder. This sends Carly down a dangerous path for herself and her children.
When the Chief takes Carly off the case because they are being sued, she brings in her twin sister, a homicide detective from Sarasota, Florida to solve the case.