The Sign of Four Spirits (A Sherlock Holmes Bookshop Mystery Book 9)

The Sign of Four Spirits (A Sherlock Holmes Bookshop Mystery Book 9)

by Vicki Delany

4.6 (432)

4.6 stars from 432 reviews

265 pages~4.4 hr readPublished by Crooked Lane BooksPublished 2024-01-09

$1.99Deal90% off peak

Last checked: May 2, 2026

Price history: $1.99 $18.99

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Fans of these authors will like this...

  • Agatha Christie
  • Louise Penny
  • Tana French

Fans of these books will like this...

  • The Thursday Murder Club
  • Midsummer Night's Scream
  • The Body in the Library

Perfect for you if...

  • You love cosiness wrapped around a genuinely clever mystery, where the puzzle matters more than the gore.
  • You're a series devotee who's invested in Gemma's bookshop world and wants another instalment that delivers on character.
  • You enjoy settings steeped in Sherlock Holmes lore without needing to be a superfan to follow along.

Maybe not for you if...

  • You want occult horror or genuine spookiness. This leans cosy mystery, not supernatural thriller.
  • You prefer standalones. Book 9 assumes you know who Gemma, Jayne, and the regulars are.
  • You're after dark twists or morally grey characters. This is straightforward whodunnit territory.

About this book

A psychic fair comes to West London, and Gemma Doyle, owner of the Sherlock Holmes Bookshop and Emporium, is persuaded by Donald Morris, an enthusiastic Sherlockian, to attend a séance. She brings along her best friend Jayne Wilson, a baker; Ashleigh, her store assistant; and Bunny Leigh, a former pop star. Gemma is unexpectedly barred from entering the séance room. Listening from outside, she hears the medium tell Donald that Sir Arthur Conan Doyle will not be appearing. Moments later, she hears a voice cut off, a cry for help, and a scream. She rushes in to find someone dead on the table. All windows are locked, and Gemma was the only person guarding the door. With a murderer present in the sealed room, Gemma begins her investigation. She must determine whether the killer is a living person or something summoned from beyond.

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Price History

Kindle price over time. Green zones = periods when the book was free.

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Free$9.49$18.99May '23Jul '24Mar '25May '26
$1.99$18.99

Currently on sale at $1.99 — 90% off peak. Price has dropped 4 times over the last 3 years. Goes on sale roughly every 180 days. Typically stays discounted for 101 days.

Sales Rank

Amazon sales rank: lower number = better selling book. #1 is the bestseller.

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#5,557#289,111#572,665May '23Nov '23Jun '24May '26

Currently around #69K in the Kindle store — a steady mid-list seller. Sales have softened 69% recently.

Rating & Reviews

Purple line = star rating over time. Blue area = total review count growth.

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4.0★4.5★5.0★Jan '24May '24Dec '25Apr '26RatingReviews

Currently 4.6★ from 432 reviews

Gaining approximately 15 new reviews per month. Rating has remained stable at 4.6 over the tracking period.

Sale Prediction

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Free$9.49$18.99May '23Jul '24Mar '25May '26PredictedMay '26

Actual Predicted

This book is currently discounted at $1.99. It typically returns to around $18.99.

Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.

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Vicki Delany

1 book on Vagrant Press

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