When a nurse is found murdered in the Royal London Hospital, Cassie think it's going to be just another one of Violet's regular old murder cases to solve. But when they find out that the woman was killed by her accomplice, and that he got away with a number of vials containing the Ebola virus, the stakes suddenly get a lot higher.  

When a woman is found strangled in the London borough of Soho, the police think it's a suicide, but Violet Despuis knows better, and Cassie knows that if Violet thinks it's murder, it's murder. The two women find themselves needing to prove not only who committed the crime but also that a crime was committed at all. As Cassie joins Violet in investigating the crime, they quickly find themselves embroiled in a controversy that lands them on the front page. And just in case that wasn't complicated enough, Jake is being secretive, and Cassie is pretty sure someone is following them.

When Violet is hired to prove the innocence of a convicted murderer, Cassie discovers that not only is an innocent man's life at stake, but also that solving a 10-month-old murder has its own unique challenges. But what initially seems like it might be a straightforward case quickly becomes more complex with the discovery of a secret computer file and an encryption even Violet can't crack.

When a body is displayed publicly in King's Cross Station, the Metropolitan Police quickly finds itself embroiled in a media circus and pulls out all the stops to find the killer - including begging Violet for help. However, what Cassie thinks is going to be a regular old case quickly becomes personal, and she and Violet quickly realize there's a lot more at stake than just catching a murderer. 

There's murder and mayhem in Mayfair today. When Violet calls Cassie over to investigate a murder in Mayfair, Cassie figures it's going to be a pretty easy solve, especially when they immediately hone in on a main suspect. But things get a lot more complicated when it turns out the suspect has an airtight alibi. Meanwhile, things at home are going to get more hectic for Cassie when Jake has a brand new surprise to show her. And why do the nightmares that started when Cassie was officially registered as a doctor refuse to go away?