It is time for the claws to come out in the upcoming episode of "Mistresses." Joss (Jes Macallan) will finally discover what has been keeping Kate (Tabrett Bethell) busy lately and she will not be happy about it.

In "Bridge Over Troubled Water," TV Guide reports that the blonde Aussie's secrets will be exposed when Joss learns that she is hooking up with her ex, Scott (Justin Hartley). It appears that April (Rochelle Aytes) was right when she cautioned Kate to be careful with her actions, since Joss would probably hit the roof once she discovered the truth. Kate has been pursuing Scott nonstop since they met. She even turned up in his clinic uninvited with the purpose of seducing him. For his part, Scott did not want to get involved with Harry's (Brett Tucker) sister. He could not help but change his mind, though, when she went all out to get him.

With Joss happy with her new relationship with Harry, she should not care about what has been happening with her ex's life. Scott is free to date whomever he wants. Hooking up with Kate, however, is not an option. How would they feel to be in a double date with the Davis siblings? Things are about to get worse, though, when Scott turns up at Joss' doorstep. In the promo, Joss looks very surprised to find Scott behind the door. He then tells her he still loves her and swoops in for a kiss. Joss does not look repulsed with the action, though, perhaps because she is too shocked at his daring move. What will happen now to these two?

Meanwhile, April's mother is in town and she is determined to learn as much as she can about her daughter's new rocker boyfriend. Marjorie (Lynn Whitefield) even wants to stay at April's house and spend the time in comfort after her liver transplant. Since April and Marc (Rob Mayes) are living together, things are about to become very awkward for everyone concerned. Will April last the upcoming weeks without pulling her hair out?

"Mistresses" season 4 airs Mondays at 10 p.m. EDT on ABC.