Which people have the best motives for blackmailing?

Dr. Black may have guessed who was blackmailing him - how?

Be careful of Red herrings.

Can you account for the movements of all weapons?

Are all weapons where they should be?

Who had access to which weapons?

When was Dr. Black killed?

Who had the opportunity to kill Dr. Black?

Where was Dr. Black killed - are there any clues as to his movements?

Why would he be in that room?

Who has been acting out of character?

- Why?

- Does that reason make sense given their background?

Don't rule out the possibility of the murderer trying to frame someone else.

Still stuck (or your web browser doesn't support Javascript)? Then click here for the solution…