Luchezar Angelov presents his novel "Invisible Blue" today at the Peyo Yavorov Regional Library in Burgas. The event starts at 6.30pm.

The characters are three married couples on a seaside holiday. According to the author, unusual relationships develop between them, and each person believes these imagined ties stay hidden from their partner.

"By the time they realise it, invisible things between two people who are so close are very hard to keep hidden," Angelov told Bulgarian National Radio.

The book is described as a journey through the invisible dimensions of human existence, through the personal and the unspoken, and through the hidden side of relationships between people.

The literary talk will also feature his previous novel, "Tunnel to the Sunrise". Burgas actor Alex Anmakhyan will read excerpts.

The event is part of a visit to Burgas by the publisher Biblioteka Bulgaria.