There are 2 books in the Michael Osbourne series. The newest book is The Marching Season which came out in 1999.

1
The Mark of the Assassin

Book cover of The Mark of the Assassin

A secret organisation, an assassin, and the one man who knows his identity...

From the No.1 bestselling author of THE CELLIST

'A terrific thriller ... One of the best-drawn fictional assassins since THE DAY OF THE JACKAL' San Francisco Examiner

'A must-read' Entertainment Weekly

A secret world organisation of wealthy…

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2
The Marching Season

Book cover of The Marching Season

A brilliantly tense what-if thriller about the sabotage of the Ulster peace process.

From the No.1 bestselling author of THE CELLIST

During the first uncertain years of the Northern Ireland peace process three simultaneous terrorist attacks in Belfast, Dublin and London shatter the hope that the bloodshed is finally over.…