Chama vermelha ardente (1985), de Ward Hawkins?

Harry Borg is an aging alcoholic who is waiting for death when one day a nail appears in the middle of his apartment sticking out of an invisible wall. When the hole caused by the nail is enlarged (from the other side)a nice guy named Guss pops in. Guss is a reptilian humanoid who seems to find Harry VERY interesting. One day Harry wakes up to find he is now young, handsome and about to go on an adventure that is out of this world. It seems Guss's people need help. While they are very advanced they have been fighting a war for thousands of years and are starting to lose it. They figure the aggressive human's courage and strengths can help them win it. But what happens when the Hero finds out that some of his 'Allies' look at him like we would look at a good T-bone steak? Lizard-people with flying cars, giant bugs used as guard dogs and Grade "A" humans that go great with barbecue sauce, what more could you ask for in a sci-fi book?
_-Amazon

Encontrado por Googling mundo do lagarto portale, em seguida, localizando um link para Série de ficção científica sobre um mundo paralelo povoado por homens-lagarto, cujo portal foi descoberto por um alcoólatra em seu apartamento?.