If you could change one event from your past, would you?

Helena congratulated herself for settling into her life quite nicely-until Brown reappeared as she tidied up after the Wizard of Oz themed party.

A disturbing glitch had been discovered in the Watcher 22 program.

Helena and the team are reunited to rescue clients unwittingly trapped in their past. With the merest whiff of a threat to national security, MI6 inevitably join the fray. Could the past be reinvented using Watcher 22? Was it time to hit the kill switch? There would always be consequences.