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The new Dr Lance Elliott mystery, set in 1970s south London . . . - July, 1977. Lance's eccentric father, the retired Dr Benjamin Elliott, has been running a Horticultural Club at a local school, in an effort to impress his lady friend, Ada Clarke, who works there. One summer evening, Lance and his girlfriend Max turn up for the parents evening to show their support for Benjamin's efforts, only to find themselves - much to the consternation and irritation of DI Masson - caught up, once again, in a local killing spree, as it seems that teachers from the school are being targeted . . .