Inspector Lewis Endeavour, help by the Crime Room detectives, has made an arrest below you can read his reasoning and see why he picked the suspect he did...

Are you sure you want to know who did it? Have your little grey cells exhausted all the avenues of enquiry?

If not then stop now and examine the evidence further….

Are you ready?

Very well, we will continue.

So they all seem like a suspicious lot don't they?

The village simpleton Carl Bartlett. He was a bit of a loose cannon wasn't he? Rejected by his father, confused over his own identity but very fond of Marilyn - too fond to murder her.

Guy. The smarmy cad with everything to lose - too much too lose. He had got Marilyn pregnant but we can't be totally sure he knew he had, and his alibi is watertight. We even have CCTV footage showing him to be where he said he was.

Gemma. Jealous and pathetic but there is nothing to suggest she actually did the crime.

The Professor. Well, he played a small part, but unwittingly. When he said that the blackmail must stop someone took that a little too literally…

Rebecca claims that she was in the library until late, hoping this would lead us to believe she was there at the time the murder was committed. But we see that she was in the off-licence just before the murder took place, buying wine.

She was a chemist and could have acquired the drug that would put her victim to sleep so she need not try to over-power her.

There was no sign of forced entry to the room because she had a key and finally after the murder had taken place she called the Professor.

We know she was the only one other than the deceased to use the phone because of the fingerprints we found. So it must have been her that made a call to her lover from the phone in the room.

Panicking she tried to frame the simple groundsman Carl, fabricating some story about him visiting Marilyn's room.

The murderer was Rebecca.