If you watch season one, episode five (charlies birthday) at the part where elle is trying to stop tao from telling charlie about nick's date with Imogen, Nick asks issac what he is reading in the background. Issac is reading radio silence. He then explains the plot of the book. It's heard to hear over elle and tao, but youll be able to hear most of it.
I only saw this on my 100000th rewatch lol