Help solve the case!

Do you know what July’s Flavor of the Month is? I’ll give you a hint. And actually, that’s the hint. It’s all about clues and figuring things out. That’s right—mysteries. We have a lot of great mysteries here at the library, and I’m really looking forward to reading some. The thing is, I don’t really like series. I have an intense impulse to start at the beginning, and once I start something I don’t like to stop. And even if I do, I’m wondering what I missed. Or, like the Harry Potter books, I have to wait for the next books to come out and that is just so hard sometimes. But enough of my issues, here are some mysteries from the Partners in Crime bookmark. Why solve cases by yourself when you get help from a quirky side-kick? These annotations were respectfully taken from Novelist.
The Matters of Mansfield; Or, the Crawford Affair by Carrie Bebris
Elizabeth and Fitzwilliam Darcy's delight over the birth of their first child is overshadowed by a family crisis involving marriage machinations, star-crossed lovers, and mistaken identity.

Murder on the Celtic by Conrad Allen
Working as ship detectives for the passenger lines of the early twentieth century, George Porter Dillman and Genevieve Masefield discover during an Atlantic crossing aboard the Celtic that one of their passengers is Sir Arthur Conan Doyle.

Who’s Sorry Now? by Jill Churchill
Making the acquaintances of a young widow and her German grandfather, new arrivals in the Depression-era Hudson Valley, Robert Brewster and his sister, Lily, fear for their new friends' safety when a swastika is found painted on the widow's window.

Speak Now by Margaret Dumas
Charley Van Leeuwen begins to suspect that there is more to her new husband, meteorologist Jack Fairfax, than he claims, when she is suddenly caught up in a bizarre web of kidnappings, nasty former spies, bitter ex-boyfriends, strange relatives, and murder.

Black Ship by Carola Dunn
Daisy Dalrymple and her Scotland Yard detective husband, Alec Fletcher, are delighted to move into a home on the outskirts of London they have inherited from Alec's late uncle, until a corpse turns up.

Murder Boogies with Elvis by Anne George
Enjoying their golden years, amateur sleuths Mary Alice and Patricia Anne are delighted to be invited to a benefit, but their fun turns deadly when an Elvis impersonator takes a fatal dive into the band and the sisters must find a killer.

The Burnt House by Faye Kellerman
In the aftermath of a suspicious commuter plane crash in Los Angeles, police lieutenant Peter Decker investigates the claims of one family that foul play had been involved, a suspicion that gains credibility when a key victim is discovered to be someone else.

Locked Rooms by Laurie R. King
Mary Russell and her husband Sherlock Holmes unlock the buried memory of a shocking crime with the power to kill again-lost somewhere in Russell's own past.

Murder Melts in Your Mouth by Nancy Martin
Sensible Philadelphia debutante Nora Blackbird turns sleuth when her friend Lexie becomes the prime suspect in the killing of a prominent Philadelphia philanthropist, but her investigation is complicated by the return of her scheming parents.

Southampton Row by Anne PerryA general election is approaching and Thomas is called to monitor the bitter struggle for one crucial London seat.