A political aide is struck by a rush hour train at a busy London station. But what initially looks like a tragic accident is, in fact, the first in a chain of events that will shock the world to its core.

On the morning of his death, Jeff Tindle was on his way to meet journalist Peter Sacks, promising a major scoop involving the Leader of the Opposition. It is only when Tindle fails to show - and Sacks sees the news - that the true gravity of the situation becomes apparent.

When Sacks receives a mysterious voice note - becoming the only man alive who knows the whistleblower's secret - it is both the first piece of the puzzle in a shocking international conspiracy, and the beginning of a deadly investigation into the dark, deceptive heart of power.

The Whistleblower is the story of a journalist who is thrust into a political conspiracy, and the people in power who will stop at nothing to keep him quiet.

Robert Peston is ITV's political editor, presenter of the politics show 'Peston', founder of the education charity, Speakers for Schools (www.speakers4schools.org), and vice president of Hospice UK. He has written four critically acclaimed non-fiction books, How Do We Fix This Mess?, Who Runs Britain?, Brown's Britain and his latest, WTF?, which was described by the Financial Times as 'mandatory reading' for anyone seeking to understand Brexit, Trump and the collapse of confidence in western liberalism. For a decade until the end of 2015, he was at the BBC, as economics editor and business editor, and in the 1990s he was at the Financial Times, as political editor, financial editor and head of investigations. At the BBC he played a prominent role in exposing the causes and consequences of the credit crunch, banking crisis and Great Recession. Peston has won more than 30 awards for his journalism, including Journalist of the Year and Scoop of the Year (twice) from the Royal Television Society. The Whistleblower is his first novel. His blog is itv.com/robertpeston, on Facebook he is facebook.com/pestonITV and he is @peston on Twitter.