- When a woman is found dead with a bottle of pills that are lab trial samples, Lassiter and Gus, who are taking the same tap class, team up to dance their way to catching a murderer.
- Open with a flashback to young Spencer learning that young Gus is into tap dance.
A car is pulled out of the water with a woman inside. Lassie isn't sure if Jules is ready for a case and takes the case for himself. Spencer and Gus arrive. Lassie determines the woman, Desiree Blake, took a turn too fast and put the car into the water. Spencer glances inside and notices the rearview mirror and a mark on Desiree's ankle. He tells Lassie the victim was not alone. Gus tells Spencer he's going to a new tap class, which Spencer finds silly. Lassie hears the conversation.
Lassie shows up at Gus' tap class. Gus teaches him a few steps and Lassie finds that it helps clear his mind. Lassie calls into the lab looking for information about pills found in the car. When Gus offers that the pills must be from lab trial, Lassie asks him to join him for the investigation. Spencer waits for Gus outside class and learns Gus is working with Lassie without him.
At a lab Gus and Lassie speak with Lillian, who tells them the pills were part of an experimental fertility treatment. She ran the trial alone. When she goes to get the logs Gus tells Lassie it is impossible only one research technician would run such a trial. Gus spots Spencer in another part of the room. He installed a GPS parental control in Gus' phone and followed him to the lab. Gus and Lassie leave Spencer without access to the case.
Henry puts Spencer to work on the same case and teams him with Jules. Spencer tells her about Lillian lying about not having a partner.
All four of the investigators question Lillian at the same time. She admits that she had been protecting her partner, Ben, who was Desiree's boyfriend. He had been giving Desiree pills under the table because the couple was trying to have a baby. She doesn't think Ben is capable of killing Desiree.
Both of the partnerships rush to Ben's house. While they sit and argue over who is the lead team on the case, an SUV breaks through the garage door and speeds away.
After explaining to Henry that they let Ben get away, the four get to work finding Ben. Gus has Lassie do some tapping to clear his mind. Lassie remembers that Ben and Desiree only had one car, meaning the one they saw must be a rental. Spencer and Jules see the tapping and have fun at their expense.
Jules and Spencer go to the fertility center and talk with a flirty employee named Tanya. While Jules pretends to be interested in volunteering for the trial, Spencer snoops around Ben's computer. He sees that the day after Desiree's death Ben sent some flowers.
Gus and Lassie go the rental car place and get a tracking number for the LoJack on Ben's car. Lassie thinks Ben's motive was that they were common law husband and wife and she would have gotten half of everything. Gus isn't so sure.
Desiree's mother tells Jules and Spencer she thinks Ben could have something to do with her daughter's death. She adds that he sent flowers after her death.
Gus and Spencer run into each other at Ben's rental (Spencer followed Gus using the GPS on his cell). Ben walks out from a motel room and tries to run. The guys catch him immediately and he tells them he didn't do anything. Ben tells them they've lived together for five years, two shy of common law status. Lassie and Jules show up with guns drawn.
At the station Spencer tells Lassie he doesn't think Ben is the killer. Spencer and Gus decide to team up again, as do Lassie and Jules.
The coroner tells the guys Desiree dies of drowning. He noticed what looks like freezer burn on her ankle and said she had no signs of struggle.
Lillian shows up at the station with proof that Ben was in the lab during the time of Desiree's murder.
Over hot dogs Spencer remembers Desiree's mother saying something about Ben cheating. They decide to find out the identity of the other woman.
The guys arrive at the beach and learn that a dead surfer was pulled from the ocean. It is Ben.
Like Desiree, Ben's body showed no sign of struggle. The coroner suggests "dry drowning," which could be accomplished by a high dose of anesthesia. Spencer flashes to the lab worker Tanya referencing anesthesia.
At the lab Tanya admits to the affair with Ben. She says it was a one-time thing and she does not have access to the anesthesia. Spencer then accuses Lillian of killing Desiree because she wanted Ben to herself. After Ben hooked up with Tanya, Lillian saw this as an opportunity to move in. She gave Desiree a high dose of anesthesia and placed her behind the wheel of her car. Afterwards Ben did not fall for Lillian and she killed him.
Spencer and Jules sit in the audience for a tap showcase featuring both Gus and Lassie.
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