The River Case

Inspector Strong takes a vacation away from everything with Mildred his wife. Returning to his truck, after fishing, he spots a body near a snag. He rushes to push the body into an eddy until he can retrieve it. A make shift hook brings the body to shore. A forest ranger helps get it into the truck and the Inspector drives it to the lodge. Overnight the body and evidence are taken from the cooler before the sheriff arrives. The sheriff is at a dead end.
A just married couple and her father are on a vacation. The red head is Penelope and her husband is Stan. The father of the bride is called daddy Smith. Stan has one drawer for his clothes and sleeps on the sofa.
Stan goes fishing with Inspector Strong and they scout possible murder sites. The Inspector wishes to leave, and someone tries to sabotage some wires in his truck. He now must stay until the truck is checked out for being safe.
Penelope (Detective Rage) roughs up a jewelry thief. Stan (patrolman Jones) is set as bait to catch the killers. How does the FBI get involved?