The Case of the Missing Marquess : Enola Holmes by 
Enola doesn't appear in the original Sherlock Holmes series, but the character does make an appearance in some adaptations over the years.
If you are listening to the audiobook, make sure that you are folowing the text. Take time at the end of each chapter to reflect on the theme of the chapter.
When Enola Holmes, sister to the detective Sherlock Holmes, discovers her mother has disappeared, she quickly embarks on a journey to London in search of her. But nothing can prepare her for what awaits. Because when she arrives, she finds herself involved in the kidnapping of a young marquess. Amid all the mayhem, will Enola be able to decode the necessary clues and find her mother?
Enola Holmes is being hunted by the world's most famous detective - her own brother, Sherlock Holmes. But while she is on the run, she discovers a hidden cache of charcoal drawings and feels as if she is a soul mate to the girl who drew them. But that girl, Lady Cecily, has disappeared without a trace. Will she be able to keep her identity a secret and find Lady Cecily?
Everyone knows Dr Watson is Sherlock Holmes' right-hand man - so when he goes missing, it's a shock. Even Sherlock hasn't the slightest clue as to where he could be. Enola is intrigued but wary; she's still hiding from her older brothers, and getting involved could prove to be disastrous. Enola knows she must act quickly, but can she find Dr Watson in time?
Enola is thrown into a tailspin when she receives a desperate message from her old friend, Lady Cecily. Enola knows she must help her friend before it's too late - but she doesn't know how! Enola must risk her own freedom and join forces with her brother, the famed Sherlock Holmes, to free Cecily. Can Enola trust her brother, and can they save Cecily in time?
Enola’s landlady, Mrs. Tupper, is the closest thing Enola has to family these days. So imagine her horror when Enola comes home to find Mrs. Tupper kidnapped! Who would take her, and why? And what does Florence Nightingale have to do with it?
As Enola searches for the missing Lady Blanchefleur del Campo, she discovers that her brother Sherlock is just as diligently searching for Enola herself! Sherlock and Enola must solve a triple mystery: What has happened to their mother? And to Lady Blanchefleur? And what does either have to do with their brother, Mycroft?
When a young professional woman, Miss Letitia Glover, shows up on Sherlock's doorstep, desperate to learn more about the fate of her twin sister, it is Enola who steps up. It seems her sister, the former Felicity Glover, married the Earl of Dunhench and per a curt note from the Earl, has died. But Letitia Glover is convinced this isn't the truth, that she'd know--she'd feel--if her twin had died.
Isolation: aloneness, working on your own, away from others.
Independence: very capable of taking care of one's own self, can manage on your own.
Women: themes of a strong female, not needing a male to look after them.
Compassion: having thought and consideration and care for another.
Mystery: the secrecy and unknown of the story. What Enola has to work out.
Siblings/Family: sister to her famous brother, Sherlock Holmes. Rivalry, and independence from her two older established brothers.
Missing Persons: Enola's mother has gone missing.
Disguise: Enola is a master at disguising her identity.
Secrecy: the manner of hiding her identity, getting by on keeping secrets, and protecting herself.
London in Victorian Times: Set in a time of women slowly realising they are capable of standing up to males, that there is equality, that females are strong and independent.
What is Enola Holmes real name?
Why is her name Enola Holmes?