Too Pretty to Die (Eva Rae Thomas Mystery)

Four women went on a weekend of fun to Miami. Four best friends who were inseparable.
No one returned.
The story made national headlines, and even after weeks of searching for them, they were never found.
What happened to them?
Are they still alive?
Ten years later, the teenage children of those same four women decide to take a trip together against the wishes of their families.
They are followed by a TV crew doing a true crime show. They're returning to Miami to find out what happened to their mothers.
When they unearth the mutilated body of one of their mothers, they know they are in way over their heads, and soon they realize nothing is what it seems as this vicious killer is getting ready to chase them down.
FBI profiler Eva Rae Thomas is called in to help when the second body is recovered from the trunk of a burnt-out car in the swamps outside Miami, bringing her old flame Matt to help.
Soon, she realizes she is hunting down a serial killer unlike any other she has encountered, who will next come after someone she loves.