'Thrilling time travel adventure' The Guardian

The exciting final instalment of the Time Keys series. Sim and his renegade friends battle the tyranny of the Council in Victorian England in the sixth epic Time Keys adventure by multi award-winner M. G. Leonard. Illustrated throughout by Manuel Šumberac.

Emboldened by Sim’s growing powers, the Time Keys plan an uprising to overthrow the Council of Keys and end their tyranny over time. Sim, Nelson, and Jeopardy lead a band of renegade keys back to Victorian times, through a door in the Royal Albert Hall, to infiltrate the music collage, confront the Council in York Minster, rescue Sim's mum, and bring down the dreaded Chairman, Kane Wolfe. But he is not the kind of man to go quietly . . .

Operation Key Change can be read as a stand-alone novel, or enjoyed as part of the thrilling Time Keys series by M. G. Leonard. Follow Sim, Jeopardy and Nelson's adventures in Ancient Egypt, Hunt for the Golden Scarab, Viking Norway in The Legend of Viking Thunder, Ancient Rome in The Impossible Gladiator, Tudor England in Attack of the Sea Dogs, and William the Conqueror's Normandy in Prisoner in the Castle . All titles support the key stage 2 curriculum.

Praise for the Time Keys series:

‘Classic and fresh – a breathtaking adventure’ - Eoin Colfer, author of Artemis Fowl

‘Fabulous, fast-paced and thrilling’ - Jonathan Stroud, author of the Lockwood & Co. series

‘Fast, dramatic, exciting’ - Hannah Gold

‘Thrilling adventure packed with history, mystery and action’ - The Week Junior