PLANIGMA

Floor-Plan Mystery Puzzles

Volume One The Halmerton Case Files

Everyone was somewhere.
Only one of them was with the body.

Fifty murder mysteries you solve with a floor plan, a pencil and nothing else. Read the statements, work out where every guest was standing, and the room with the body will hold exactly one of them.

Get Volume One Try a case first

Paperback · 8.5″ × 11″ · full colour interior

The Halmerton Case Files, volume one of PLANIGMA

How it works

Three steps, and no guessing at any of them

  1. 1

    Read what they told the inspector

    Each guest says where they were — or, more often, where somebody else was not. Every statement is true.

  2. 2

    Place everyone on the plan

    One guest per row, one per column, never two in the same square. The statements rule out the rest.

  3. 3

    Look at the room with the body

    When the plan is full, exactly one guest is standing in it. You have not guessed. You have proved it.

Try one now

The body is in the study

Four guests, a four-by-four plan, four statements. One of these people is a murderer, and the statements are enough to say which.

Four guests to place

  • Mr Cole
  • Lady Fenwick
  • Dr Hallam
  • Miss Ashby

The statements

  1. Mr Cole was in the northernmost row. Miss Ashby was in the southernmost.
  2. Lady Fenwick was in the library, in the westernmost column.
  3. Dr Hallam was the only person in the kitchen.
  4. Mr Cole was west of Dr Hallam.

Sure?

You can only be told once. If you would rather work it out, the plan and the statements are still there.

Why the seal is on the cover

Not checked. Exhausted.

Most puzzle books tell you there is one answer. This one has counted. Before a case is allowed into the book, a program lays out every legal arrangement of the guests on the plan and tests the statements against each one in turn.

The little case above has 576 arrangements. A full six-by-six case from the book has 518,400, of which 111,360 obey the rules of the board. If more than one of them survives the clues, the case is thrown away and never reaches you.

That is what the seal means. It is a measurement, not a promise.

The house party

Fourteen people. The same fourteen, every time.

You will get to know them over fifty cases — who is likely to be in the cellar at midnight, who never goes near the library. Four of them are found dead across the volume. The other ten have some explaining to do.

One of the fourteen at Halmerton House

Volume one

The Halmerton Case Files

  • 50 cases, and one more. The fifty run from a gentle four-by-four to a six-by-six that will take you an evening. The fifty-first is announced on the first page and waits at the end.
  • Every solution explained. Not an answer key — the reasoning, step by step, in the order you would have found it yourself.
  • Room to work. Large format, printed in colour, with a plan big enough to write on in pen.
  • One house, one cast. Fourteen people, one Victorian manor, and a body in a different room every time.

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Not sure yet? Download four cases free  ·  Also available in Italian as I Casi di Halmerton House

PLANIGMA

Floor-plan mystery puzzles by Ada Vellacott