As soon as they had finished filming their apology, Andy brought up the Games Thinker website.

Every muscle tensed, the boys stood together and watched the website countdown run out.

‘It’s freaky knowing there might be another attack somewhere,’ Andy said, ‘and not being able to do a thing to stop it.’

Dylan swallowed hard.

Without missing a beat, the screen changed.

‘The Second Sign?’ Dylan mused.

Equally puzzling was the new message that had appeared above the timer.

Before Andy could reply, his and Dylan’s phones vibrated with incoming texts.

The boys eyed their screens nervously.

‘I’ll go first,’ Andy said. ‘Open text.’

‘Another symbol?’ he said.

‘Open text,’ Dylan said.

‘What are they?’ he asked when his symbol was revealed.

‘I don’t know,’ Andy said. ‘But the pattern’s repeating—countdown, phrase, symbols. It’s what the website says: The Second Sign.’