The Clarendon Lexicographers

An anonymous letter arrives at the offices of the Clarendon English Dictionary containing a challenge for the team of lexicographers working there. It's clear that's it's not the usual run-of-the-mill, eccentric enquiry. The letter hints at secrets, lies and a year. 2010. For Martha Thornhill, the new senior editor, that year can mean only one thing: the summer her brilliant, beautiful older sister Charlie went missing.

When mysterious symbols appear as graffiti around Oxford, lexicographer Martha Thornhill recognises them from a runic alphabet created by a deceased fantasy writer whose papers she once worked on. But this is no publicity stunt, and tensions intensify when further graffiti is found near the body of a university lecturer. Martha is not the only one to have doubts when the suspicious death is ruled by police as suicide. Called upon to lend their linguistic expertise to the case, Martha and her colleagues begin to unearth a tragedy that extends beyond the ancient walls of the university.