WARNING: This article may contain spoilers for When Calls the Heart season 7 episode 4. Read at your own risk.

When Calls the Heart season 7 episode 4 is set to arrive later this week on Hallmark Channel, with the title "Sweet and Sour." This episode will see the people of Hope Valley facing crisis, as chickenpox outbreak hits the town. This is a serious problem, considering that the world within this series does not offer more remedies for it. So, Elizabeth will do whatever she can to make sure the town is safe.

In When Calls the Heart season 7 episode 4, the people in Hope Valley face as a major crisis as they need to deal with the threat of chickenpox outbreak. Elizabeth does her best to make sure the town is safe. She also takes action after one of her students becomes infected, so they avoid the illness from spreading in the town and affecting other people.

Meanwhile, Bill is assembling a jury to hear a lawsuit against Gowen, but the chickenpox outbreak presents an additional problem for him as it also makes Rosemary extremely sick. Worried about her, Lee stays close to Rosemary's side. Faith, on the other hand, decided to miss her ride to medical school so she could help Carson care for Rosemary.

However, Faith's decision could end up having some huge consequences for her future, especially to her medical school. It can also be noted that her future in Hope Valley is uncertain, given that Andrea Brooks, who plays Faith, joins The CW's Supergirl. Hence, Faith might not be frequently seen in the Hallmark Channel series.

Meanwhile, aside from the threat of chickenpox outbreak, When Calls the Heart season 7 episode 4 will also continue focusing on Elizabeth's conflicting love life, with Nathan and Lucas continue vying for her affection. Also, Nathan investigates the case of Gowen, while Lucas realized that Gowen is ruthless when it comes to business.

In another report, series star Erin Krakow (Elizabeth) and Jack Wagner (Bill) discussed what viewers can expect this season in a recent interview via Access Hollywood. They teased that some of the characters will be facing new tests, but there's still a chance to see the characters having fun. Additionally, the series is more than just romance, as it also focuses on family, connection, as well as happiness.

When Calls the Heart season 7 episode 4 will be airing on Sunday night, Mar. 15, on Hallmark Channel.