Gefter's journey through the big questions of physics and cosmology can be summed up by her quest to understand the words of her central character, physicist John Archibald Wheeler, in describing the universe as a "self excited loop" and his obsession that "the boundary of a boundary is zero". After Wheeler died, Gefter and her father read Wheeler's vast collection of journals seeking answers. In many ways, Gefter's book is like the Wheeler journals, it is an enquiring narrative of her journey to gain an inkling of the basis of reality.
`Trespassing ...' is embellished with a very helpful glossary, Notes and a well considered `Suggestions for further reading'. However, the warm and entertaining narrative is the strength of Gefter's book. Her journey, accompanied often by her father, to understand reality through discussions with the great thinkers in modern physics is enlightening. Many of the players, for example John Wheeler and Leonard Susskind, emerge pretty much as you would expect them - amazing thinkers - but many others are surprisingly different and are characterised wittily by Gefter. Her allegorical journeys through rat-holes in London and nerdy colloquia reinforce her story of the quest for the `ultimate reality' (this being the title of the first conference she conned her way into, although "ultimate" would be a term the reader will discover to be very relative).