You've Got (Sherlock's) Mail.

A letter arrives at your door.

An old friend is facing a challenging mystery, and they need your help.

Every week you'll receive one letter with new evidence from your worldwide network of sources & experts. 

Can you solve the monthly mystery?

Turn your mailbox into a mystery box.

Sherlock Holmes’s clients, sources, and colleagues are now your pen pals.

How It Works


A New Mystery

Dig into a new Victorian-era mystery every month.


Weekly Letters

Every week a new letter will arrive to your door with new evidence on the month's mystery.


A Global Competition

Compete against detectives from around the globe.


The Big Reveal

At the end of each mystery Sherlock will write you a letter solving the crime.


Mystery Packages

.(Each month includes one mysterious case and four evidence-filled letters)

3 Cases



A season of mysteries for detectives just getting their start.

6 Cases



A half year of mysteries for a greater challenge.

Full Year



A full year of mysteries for expert detectives keen on solving every case.


Frequently Asked Questions

How hard are these mysteries to solve?

Most detectives will be able to solve our mysteries once all the evidence is available. Only the best will be able to solve them early.

Will you notify my gift recipient of their gift?

No. We don’t want to spoil your surprise, so the first communication they’ll receive from us will be a mysterious letter in the month you selected as a start date.

Do you have a welcome letter I can present to the recipient?

We have a brief welcome/explanation letter from Mr. Holmes which you can download and customize here.

When should I start?

New mysteries start each month. If you’d like to start as soon as possible, select next month. If you’d like to start after a milestone (i.e Christmas, Hanukkah, a birthday), select the next month (January for Christmas, Hanukkah, and New Year’s).

Who writes these mysteries?

Dear Holmes mysteries are written by a curated selection of modern Sherlock Holmes writers. Editing is conducted by MX Publishing, the world's largest specialist Sherlock Holmes publisher.

When will the solution to each mystery be available?

The solution will be revealed in a letter from Sherlock Holmes that is made available shortly after the last evidence letter is mailed.

Do you mail internationally?

Yes, with two caveats:

1. International postage is more expensive, so our international plans are a bit more expensive.

2. International mail can take between 7 and 21 days to arrive.

Can I try my hand at some of your older mysteries?

Practice cases will be available in coming months. Check back soon! 

I need help (or have a question). Where can I contact you?

Our support form is just below this FAQ. You can also reach out to us via email at Support [at] Letterjoy [Dot] Co (Dearholmes is a collection of Letterjoy).


We have answers (but no, we don't give out hints)  


 🎁 Gift Packages

Each month includes one mystery and four evidence-filled letters

3 Month Gift

An enticing gift for friends, bosses, teachers and everyone you care about.

Most popular for:

Friends, family, retirees, mentors, bosses, teachers, and more.

6 Month Gift

A mysterious treat for family and friends

Most popular for:

Close friends, grandparents, aunts, uncles, nieces, nephews, and more.

1 Year Gift

A special birthday/holiday gift for your favorite amateur detective.

Most Popular for:

Moms, dads, brothers, sisters, sons, and daughters, and more.


Can You Solve the Mystery?

Get Victorian-era mysteries mailed to your door.