Zac is on the case of 'Lionel Tewksbury', a swindler who seems to be active again. The case introduces us, briefly, to DI Capsicum, and we come to appreciate Matt's fine qualities a little more. The upgrade of the office is completed and Mrs Chan goes undercover. It ends pretty well, Zac sells his painting, Lionel has a run in with a set of sharp teeth, Zac finds the heir 'Franks' and in the process, 'Paul', the street hustler, a possibly apprentice for Zac, though that sounds like the blind leading the blind!

'Transmutation' is the third 'Zac Tremble Investigates' story. It follows, 'Metamorphosis', the second, and 'Chrysalis', the first. These are case files of the gay, Soho-based PI Zachary Tremble.

The Zac Tremble Case Files are a barely plausible, sometimes farcical, occasionally operatic journey through Zac's world; his highs and lows, successes and failures and the emergence of one of the most touching (and funny) love affairs in PI history (do PIs fall in love?).

A story about trying to work out who you really are.