In 'Slip Knot', Zac is back in the driving seat, following his dice with death. Paul is on the case of a suspected 'extra marital relationship' but as always, nothing is as it appears. And that is certainly true when Joe dies and leaves Zac a file of papers which points to corruption and intrigue in which Zac's father may well have been implicated – it's all about having faith. Cindy moves into the flat and Zac gives a home to Yoko, Lulu and Mary – the menagerie only ever gets bigger!

'Slip Knot' is the 7th, 'Zac Tremble Investigates', case file (series one). It follows on from, in order: 'Chrysalis', 'Metamorphosis', 'Transmutation', 'The Red Kimono', 'The Ephemeris Protocol' and 'Delphes'.