Logan gonzago mountstuart, writer, was born in 1906, and died of a heart attack on October 5, 1991, aged 85. William Boyd's novel Any Human Heart is his disjointed autobiography, a massive tome chronicling "My personal r...Logan gonzago mountstuart, writer, was born in 1906, and died of a heart attack on October 5, 1991, aged 85. William Boyd's novel Any Human Heart is his disjointed autobiography, a massive tome chronicling "My personal rollercoaster"--or rather, "Not so much a rollercoaster", but a yo-yo, "A jerking spinning toy in the hands of a maladroit child.