I haven't read this specific novel by Eric Ambler, but generally his works are known for their strong plots. 'The Light of Day' might be about a journey of a character through a dangerous and shadowy world, full of unexpected twists and turns. It could be set in a foreign location, with the protagonist having to navigate through various challenges, both physical and mental.
The 'The Light of Day' by Eric Ambler is likely to be a story that delves deep into the human psyche in the face of danger and mystery. Eric Ambler has a way of creating stories that are not just about action but also about the moral and emotional dilemmas of the characters. In this novel, we might expect to see a character caught up in a situation not of their own making, perhaps being drawn into a criminal underworld or a political conspiracy. They would then have to use their wits and courage to extricate themselves while also dealing with their own inner demons. The story could be filled with suspenseful moments, as the character gets closer to uncovering the truth behind the mystery that surrounds them.