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Grimstone's Ghost
Cian O’Horgan inherits a gloomy old house from his great-uncle. Late at night, Cian senses a chill in the air, then sees a mysterious blue light glowing in the shrubbery. He has a creepy feeling that the house is haunted...

Disturbing and mysterious events follow as Cian and his lively young sister, Jo, try to find out who or what is spooking the place. They witness dangers from the past which they have to stop becoming the dangers of the future. But can they survive the sheer evil force of the ghost of Captain Grimstone, as he tries to claim the Celtic treasure?
Written by: Mary Arrigan
Publisher: Harper Collins
ISBN: 0-00-185728-2
Translations: German, Dutch, Polish, Swedish & Norwegian. Also available on audio cassette.
Baldur's Bones

When Finn and Tara discover a skull on the site of the ancient Viking burial ground, Finn is determined to take it home. This ghoulish find drags Finn and Tara into a nightmarish adventure - a race against time - one that becomes a matter of life and death.

Written by: Mary Arrigan
Publisher: Harper Collins
ISBN: 0-00-711154-1
Translations: Dutch, Danish, Norwegian & Polish.
Lawlor's Revenge
Wrongly accused of theft, Patrick Lawlor is sent to a penal colony in Tasmania. More than 150 years later, his son, Alby, sets out to avenge his father’s name. But it isn’t easy for a thirteen-year-old, especially when he’s a ghost.

Alby needs a friend, and a twenty-first century one at that. Enter Bron... a girl not afraid of a spot of adventure. But even the free-spirited Bron cannot forsee the terror and danger of what lies ahead as she and Alby set out to change the course of history.
Written by: Mary Arrigan
Publisher: Harper Collins
ISBN: 0-00-713765-6
Translations: Polish, Danish & Norwegian.