‘But it isn’t Gladys’s day out, is it?’ said Pip, surprised. ‘She went the day before yesterday.’

‘There now - you’ve dropped an ice-cube!’ said Mrs. Moon. ‘Well, I’m no good at chasing ice-cubes round the kitchen floor, so you must get it yourselves.’

Bets giggled as Pip tried to get the cold slippery ice-cube off the floor. He rinsed it under the tap and popped it into the jug.

‘Thanks, Mrs. Moon,’ he said and carried the jug and two glasses up to the playroom.

‘Mrs. Moon didn’t seem to want to talk about Gladys, did she?’ said Pip. ‘Funny.’

‘Pip - you don’t think Gladys has left, do you?’ suddenly said Bets. ‘I do hope she hasn’t. I did like her.’

‘Well - we can easily find out,’ said Pip. ‘Let’s go and peep in her bedroom. If her things are there we’ll know she’s just out for a while and is coming back.’

They went along the landing to the little room that Gladys had. They opened the door and peeped in. They stared in dismay.

Every single thing that had belonged to Gladys had gone! Her brush and comb, her tooth-brush, and the little blue night-dress case she had embroidered at school for herself. There was nothing at all to show that the girl had been there for a month or two.

‘Yes - she has gone!’ said Bets. ‘Well, why didn’t Mother tell us? Or Mrs. Moon? What’s all the mystery?’