This is the common name thread for writer Trygve Larsen / Albert Tanner / Egon Eis
CLT:
"Trygve Larsen" is credited in the following 11 titles (18 profiles)
"Albert Tanner" is credited in the following 7 titles (10 profiles)
"Egon Eis" is credited in the following 9 titles (15 profiles)

Trygve Larsen (2 confirmed, 3 unconfirmed):
Der rote Kreis / The Crimson Circle
Das Gasthaus an der Themse / The Inn on the River
Das Rätsel der roten Orchidee / The Puzzle of the Red Orchid / Secret of the Red Orchid
Der Frosch mit der Maske (confirmed by ninso4)
Die toten Augen von London / Dead Eyes of London (confirmed by ninso4)

Albert Tanner (2 unconfirmed):
Die weiße Spinne / The White Spider
Das Wirtshaus von Dartmoor / The Inn on Dartmoor

Egon Eis (4 unconfirmed, 2 invalid):
Viadukt / The Train Killer
Der Frosch mit der Maske
Die toten Augen von London / Dead Eyes of London
Er kanns nicht lassen
Wasser für Canitoga / Water for Canitoga
Der Zinker / The Squeeker