The wall paintings were an evolving work between the 14th and early 16th centuries and being situated in the naves, the area of the church associated with the laity, represent the religious preoccupations of the common people.

The wall paintings were uncovered in the 1950s-1970's and have made the building one of Northamptonshire's most significant medieval antiquarian sites.

The building consists of a chancel, a nave, a southern lean to lady chapel, a west tower, and a south porch.

On the south wall of the main body are two traceried gothic windows and a porch, inside which there are a couple of carved Mass dials.

The chancel is divided from the north aisle by a solid stone rood screen wall punctured by a central door and two traceries windows.