Mason escorted Sally Madison up the walk which led to Harrington Faulkner's duplex house.

For some reason or other, they never looked into the other side of the duplex house, but confined their investigations to Faulkner's residence.

Conor Whelan of that agency is guiding €6.5 million for the 26 apartments and penthouses and a single duplex house in the popular Robswall development.

The product range covers single houses, twin houses, townhouses, duplex houses and condominiums.

To the rear, two blocks were designed as triple-floor buildings comprising ground floor apartments with duplex houses above.

Three-bedroom duplex houses of 83 sq m (895 sq ft) start at €290,000.