Things get kinky when Booth and Brennan follow murder clues that lead to a lodge used as an S&M retreat for "jockeys" and their "horses." Meanwhile, Angela tries hypnosis in an effort to figure out her elusive husband's name so she can finally divorce him.

A wannabe singer Tommy Sour was found on a grassy location. The investigation leads Brennan, Booth, and Cam to the Checker Box Restaurant where Tommy used to sing. There are several suspects who took part in the open mike contest there, with talent scouts in the audience. The group comes together with a startling revelation for Brennan.

The pieces of a dismembered body are found lying in a purple pool of water, except the head is missing. The team finds that the body belongs to Jared Addison, a science fiction writer who had several mental problems. With Sweets' help, several suspects are hunted down, however the team has trouble finding enough evidence with the victim's head still missing.

Brennan and Booth are called to investigate what appears to be charred human remains on an electrical fence. The mysterious corpse is later determined to be a mummified Egyptian royal on loan to the Jeffersonian. The anthropological mystery has Brennan in a tizzy, and when the Jeffersonian curator prepping the mummy for exhibition is murdered, the team suspects foul play. Brennan’s investigation of the curator sheds new light on the life of the Egyptian royal, turning their case into one of historic proportions. Meanwhile, Brennan goes on a date with Booth’s supervisor and former intern, and Sweets’ girlfriend Daisy Wick (guest star Gallo) returns to the Jeffersonian.

When a human skeleton is discovered in the trenches of an old Civil War battleground, Brennan and Booth are called to the case. Despite the historical location, Brennan quickly identifies the bones as belonging to Dan Pinard, a present-day local dentist. While Booth investigates suspects, including the victim’s former boyfriend, Hodgins and lab intern Vincent Nigel-Murray work doggedly to clean the bones of a stubborn clay residue which is preventing the team from determining a cause of death. Meanwhile, Booth’s brother, Jared, returns from his travels with some suprising news.

Booth and Brennan’s next case leads them to a crime scene where a human carcass has literally melted into the dashboard of a charred truck. As the team investigates the case, they discover a gunshot wound in the victim, but learn that neither the fire nor the bullet was the cause of the victim’s death. Additional clues lead them to a local high school where the victim’s wife is a teacher. As a student-teacher relationship begins to surface and a pattern takes shape in the lab, the team is able to track down the murder weapon and solve the crime. Meanwhile, Sweets resists the temptation of allowing his feelings for Daisy to interfere with helping her pass a government psychological evaluation, and Hannah attempts to break the ice and warm up to Booth’s son Parker.