Hope and history rhyme with varying degrees of dramatic success in Big Telly's 20th-anniversary production.

It has been a long-cherished wish of the company's artistic director Zoe Seaton to create a piece of theatre about the visible and invisible inhabitants of the boglands, based on the poems of Seamus Heaney.

Three writers - Francis Turnly, Lucy Caldwell and Nicola McCartney - have developed scripts for a consciously stylised presentation, in a flexible, atmospheric set designed by Stuart Marshall, darkly lit by Conleth White and enveloped in Neil Martin's gorgeous soundscape.

The first half of the evening is shared between Turnly's slightly stilted Bogland and Caldwell's earnest Toner's Bog. Both pieces mine and probe mysterious secrets and rituals, the sometimes violent histories of the bog, where encounters between lost and found souls take place across the generations.

But it is the trio of short pieces in McCartney's Threshold that breathe life into Seaton's ambitious concept, particularly Barbara Adair's remarkable monologue, Field of Vision. The full cast - Adair, John Hewitt, Vincent Higgins, Claire Lamont, Michael Lavery and Áine O'Sullivan - finally comes together for The Tollund Man in Springtime, when the characters' complex histories are tied together in a web of intersecting storylines. - Jane Coyle

Tours to Derry, Omagh, Coalisland, Galway, Waterford, Kilmallock, Drogheda, Belfast, Strabane, Enniskillen, Monaghan, Armagh and Castleblayney until Oct 27