Est. on a rainy Monday

Mystelis Club

Solve mysteries. Make friends. Explore the world.

The case files

Choose your mystery

Level 1 / 10 · 0 cases solved

  1. Level 1 · Your next challenge
    Classic WhodunitNew case — no time yetEN · FR

    Sussex, 1934

    The Ashcombe Hall Affair

    A rain-soaked evening in Sussex, autumn 1934

    Sir Reginald Wren, master of Ashcombe Hall, has been found dead in his study on a stormy October night. The lanes are flooded, and everyone in the house has something to hide.

  2. Level 2
    Classic WhodunitNew case — no time yetEN · FR

    Cornwall, 1929

    The Poison at Gull Rock

    A tempestuous night off the Cornish coast, November 1929

    Captain Barnaby Pengelly, the stern principal keeper of Gull Rock Lighthouse, has collapsed over his chicory coffee in the lantern watchroom. With the tide high and a November gale raging, no soul could have left the granite tower.

    Solve “The Ashcombe Hall Affair” to open this file

  3. Level 3
    Classic WhodunitNew case — no time yetEN · FR

    Somerset, 1932

    Death at the Midsummer Fair

    A summer squall in Somerset, June 1932

    During the annual Midsummer FĂȘte on the vicarage green in Marston Abbots, a sudden squall drives the villagers under cover. Moments later, the parish schoolmistress is found dead beneath a dislodged bell counterweight in the vestry doorway. When it is discovered she was wearing another parishioner's heavy waterproof cape, the investigation reveals the blow was never meant for her.

    Solve “The Poison at Gull Rock” to open this file

  4. Level 4
    Classic WhodunitNew case — no time yetEN · FR

    Montreux, Switzerland, 1933

    The Secret of the Grand HĂŽtel

    A Gala Night on Lake Geneva

    Montreux, 1933. During a glittering lakeside gala, hotelier Auguste Vallon is found dead in his private office. A torn contract, a vanished key and a set of extraordinary invoices suggest that this was no ordinary crime.

    Solve “Death at the Midsummer Fair” to open this file

  5. Level 5
    IntermediateNew case — no time yetEN · FR

    Cornwall, 1936

    The Saltglass Ledger

    A death at a tidal observatory, Cornwall, 1936

    A coastal engineer dies beside a tide gauge. An altered ledger conceals one absence, while a torn chart exposes another secret.

    Solve “The Secret of the Grand Hîtel” to open this file

  6. Level 6
    Classic WhodunitNew case — no time yetEN · FR

    Montreux, Switzerland, 1933

    The Secret of the Grand HĂŽtel

    A Gala Night on Lake Geneva

    Montreux, 1933. During a glittering lakeside gala, hotelier Auguste Vallon is found dead in his private office. A torn contract, a vanished key and a set of extraordinary invoices suggest that this was no ordinary crime.

    Solve “The Saltglass Ledger” to open this file

  7. Level 7
    IntermediateNew case — no time yetEN · FR

    London, 1937

    The Aurora Reel

    A murder behind the screen, London, 1937

    At the Aurora Picture House, a proprietor dies as a preview ends. A falsified lamp log seems to condemn the watchman, but the final reel conceals a second crime.

    Solve “The Secret of the Grand Hîtel” to open this file

  8. Level 8
    AdvancedNew case — no time yetEN · FR

    Riverton, Yorkshire, England, 1935

    The Missing Crescent

    A false appointment, a stolen flood plan, and a death in Riverton, 1935

    A bookseller is killed while her husband searches for an address that does not exist. His bloody gloves and missing cash nearly settle the case, until the timing of a telephone call shifts suspicion to the people who knew her map collection.

    Solve “The Aurora Reel” to open this file

  9. Level 9
    AdvancedNew case — no time yetEN · FR

    Dorset, England, 1934

    The Marrowby Claim

    A disputed inheritance on the Dorset coast, 1934

    A woman returns after seventeen years to claim the Marrowby estate. The genealogist hired to test her identity is murdered, and a voice from his library seems to place her at the scene. Every claimant to the fortune has a secret.

    Solve “The Missing Crescent” to open this file

  10. Level 10
    AdvancedNew case — no time yetEN · FR

    Northumberland, England, 1936

    The Hollowmere Watch

    Footprints that end at a barn; a farm that carries on after death

    After a night of snow, Edith Fenwick is found murdered in her remote dairy. Footprints lead to the barn but none lead away. The farmhand's bloody hammer seems damning, while someone has tended the stove after Edith died. The answer lies in the loft, a covered milk wagon and a false veterinary certificate.

    Solve “The Marrowby Claim” to open this file

Roll of honour

Best Detectives

No case solved yet — your name could be first.

How it works

An afternoon, a mystery, friends

  1. 1

    Choose a mystery

    Pick a case and open your detective room.

  2. 2

    Invite your friends

    Share a code or link — up to 4 detectives, no account needed.

  3. 3

    Investigate together

    Search scenes, question suspects, connect the clues.

  4. 4

    Accuse

    When you're sure, name the culprit — against the clock.

The platform

Everything a detective needs

  • Question the suspects

    Ask anything in your own words; each character answers in voice and temper.

  • Illustrated clues

    Every clue and suspect painted, to inspect up close.

  • Twists within twists

    Stories unfold in hidden chapters — breakthroughs inside the big one.

  • Deduction board

    Prove your theories with evidence before you accuse.

  • Stopwatch & honours

    Gold, silver or honourable mention — climb the roll of honour.

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    Shared room, live updates, voice and video with friends.

  • English & French

    Every case exists in both languages.

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