‘The Colonel must have been in as he’s booked off duty,’ Jane said, looking at Katie.

‘Really? Well, he might have come in just after Murphy while I was on the loo, then left before I got back to my desk.’

Jane checked the duty sheet again and saw that Stanley, Cam, Bax and Teflon had booked off at the same time as the Colonel, meaning he wouldn’t have been able to take her notes without the rest of them seeing. She also realised there was no way Katie couldn’t have seen or heard all four of them in the office, even if she was in the toilet, as it was just a few feet away in the corridor.

‘How did Murphy know my notes were in my top drawer?’

‘I don’t know – but it’s an obvious place to keep them,’ Katie replied nervously.

‘You can tell me if you saw Murphy take them. I won’t rat on you.’

Katie’s mouth had gone dry and she licked her lips.

‘Like I said before, I was on the loo, so he or the Colonel could have taken them.’

Jane remembered seeing Katie by the photocopier and recalled something she herself had inadvertently done a few times when using it. She lifted the lid and her suspicions were confirmed.

‘You’re not half as clever as you think you are, Katie,’ Jane said calmly. ‘You’re also a shit liar.’

‘What on earth are you talking about?’ she asked, trying to look surprised.

‘Cut the act, Katie. You were the last person to use the photocopier – and look what you left behind.’ Jane removed the piece of notepaper from the copier. ‘This is the description of the men in the cafe – in Rachel Wilson’s handwriting. How do you explain that?’

‘Murphy or the Colonel must have left it there,’ she said straight-faced.

Jane picked up the screwdrivers and banged them down on Katie’s desk.

‘You used these to unlock my drawer, didn’t you?’

‘I wasn’t using the copier, I was trying to fix the top – it had a loose screw and I left the screwdrivers on the table.’

Jane snorted. ‘You’re the one with the loose screw. Now where are my notes?’ she demanded.

‘I haven’t got your fucking notes!’ Katie shouted, knocking her chair over as she stood up. ‘I’ve done nothing wrong and won’t be spoken to like this. I’m going home.’

She picked up her handbag and Jane ripped it out of her hand.

‘You’re going nowhere,’ she said, standing between Katie and the door.

Kate was going red in the face. ‘You have no right to keep me here against my will!’

Jane opened Katie’s handbag and tipped the contents on the floor, but neither her pocket notebook nor Rachel’s notes were there.

‘You see, I haven’t got them.’